[linux] make lldb platform status properly report kernel version

## Purpose

Make the lldb `platform status` command properly report the kernel
version when connected to ds2 on a remote Linux or Android system.

## Overview
* Rename `Platform::GetOSKernelPath` to `Platform::GetOSKernelVersion`.
It was only implemented for Windows and was never called on that
platform since Windows doesn't support platform mode.
* Fix Linux `Platform::GetOSBuild` to return the `release` string
returned by `uname(2)`. This behavior matches lldb-server behavior.
* Implement Linux `Platform::GetOSKernelVersion` to return the `version`
string returned from `uname(2). This behavior matches the lldb-server
behavior.
* Implement `Platform::GetOSKernelVersion` for Windows. There is
currently no way to test this code since Windows ds2 doesn't support
platform mode. I did this to match the fact that `GetOSKernelPath` was
previously supported on Windows.
* Leave `GetOSKernelVersion` unimplemented on Darwin and FreeBSD just
like `GetOSKernelPath` had been previously.
* Enable the lldb test that was failing due to missing kernel version in
the `platform status` result.

## Problem Details
In lldb, the `platform status` command lists details about the remote
connection. On Linux and Android, it should report the kernel version
but it currently does not when connected to ds2.

The output of `platform status` when connected to ds2 on Android:
```
(lldb) platform status
  Platform: remote-android
	Triple: x86_64-unknown-linux-android
OS Version: 34 (1)
  Hostname: localhost
 Connected: yes
WorkingDir: /data/local/tmp
```

The output of `platform status` when connected to lldb-server:
```
(lldb) platform status
  Platform: remote-android
	Triple: x86_64-unknown-linux-android
OS Version: 34 (6.1.23-android14-4-00257-g7e35917775b8-ab9964412)
  Hostname: localhost
 Connected: yes
WorkingDir: /data/local/tmp
	Kernel: #1 SMP PREEMPT Mon Apr 17 20:50:58 UTC 2023
```

Results for Linux are similar.

## Validation
Verified the lldb test
`TestPlatformCommand.PlatformCommandTestCase.test_status` now passes
locally run against ds2 on Android and Linux.

Manually inspected the output of the `platform status` command connected
to ds2:

On Android:
```
(lldb) platform status
  Platform: remote-android
	Triple: x86_64-unknown-linux-android
OS Version: 34 (6.1.23-android14-4-00257-g7e35917775b8-ab9964412)
  Hostname: localhost
 Connected: yes
WorkingDir: /data/local/tmp
	Kernel: #1 SMP PREEMPT Mon Apr 17 20:50:58 UTC 2023
```

On Linux:
```
(lldb) platform status
  Platform: remote-linux
	Triple: x86_64-unknown-linux
OS Version: 6.10.7 (6.10.7-200.fc40.x86_64)
  Hostname: placeholder
 Connected: yes
WorkingDir: /home/andrew/src/ds2
	Kernel: #1 SMP PREEMPT_DYNAMIC Fri Aug 30 00:08:59 UTC 2024
```

This output exactly matches when calling `platform status` from lldb
connected to lldb-server.

Author: andrurogerz

Headers/DebugServer2/Host/Platform.h

@@ -40,7 +40,7 @@ class Platform {
   static char const *GetOSVendorName();
   static char const *GetOSVersion();
   static char const *GetOSBuild();
-  static char const *GetOSKernelPath();
+  static char const *GetOSKernelVersion();
 
 public:
   static bool GetUserName(UserId const &uid, std::string &name);

Sources/GDBRemote/DummySessionDelegateImpl.cpp

@@ -98,7 +98,7 @@ ErrorCode DummySessionDelegateImpl::onQueryHostInfo(Session &,
     info.osBuild = build;
   }
 
-  char const *kernel = Platform::GetOSKernelPath();
+  char const *kernel = Platform::GetOSKernelVersion();
   if (kernel != nullptr) {
     info.osKernel = kernel;
   }

Sources/Host/Darwin/Platform.cpp

@@ -94,7 +94,7 @@ char const *Platform::GetOSVersion() {
 
 char const *Platform::GetOSBuild() { return GetCachedUTSName()->version; }
 
-char const *Platform::GetOSKernelPath() { return nullptr; }
+char const *Platform::GetOSKernelVersion() { return nullptr; }
 
 const char *Platform::GetSelfExecutablePath() {
   return Host::Darwin::LibProc::GetExecutablePath(getpid());

Sources/Host/Linux/Platform.cpp

@@ -73,20 +73,9 @@ static struct utsname const *GetCachedUTSName() {
 
 char const *Platform::GetOSVersion() { return GetCachedUTSName()->release; }
 
-char const *Platform::GetOSBuild() {
-  static char sBuild[32] = {'\0'};
-
-  if (sBuild[0] == '\0') {
-    char const *version = GetCachedUTSName()->version;
-    // Linux version is returned as #BUILDNO ...
-    ds2::Utils::SNPrintf(sBuild, sizeof(sBuild), "%lu",
-                         std::strtoul(version + 1, nullptr, 10));
-  }
-
-  return sBuild;
-}
+char const *Platform::GetOSBuild() { return GetCachedUTSName()->release; }
 
-char const *Platform::GetOSKernelPath() { return nullptr; }
+char const *Platform::GetOSKernelVersion() { return GetCachedUTSName()->version; }
 
 const char *Platform::GetSelfExecutablePath() {
   static char path[PATH_MAX + 1] = {'\0'};

Sources/Host/Windows/Platform.cpp

@@ -109,23 +109,21 @@ char const *Platform::GetOSBuild() {
   return buildStr;
 }
 
-char const *Platform::GetOSKernelPath() {
-  static std::string kernelPath;
+char const *Platform::GetOSKernelVersion() {
+  static char versionStr[32] = {'\0'};
 
-  if (kernelPath.size() == 0) {
-    WCHAR wideKernelPath[MAX_PATH];
-    UINT rc;
+  if (versionStr[0] == '\0') {
+    OSVERSIONINFO version;
 
-    rc = ::GetWindowsDirectoryW(wideKernelPath, sizeof(wideKernelPath));
-    if (rc == 0 || rc >= sizeof(wideKernelPath))
-      goto error;
+    version.dwOSVersionInfoSize = sizeof(version);
+    if (!::GetVersionEx(&version))
+      return versionStr;
 
-    kernelPath = ds2::Utils::WideToNarrowString(wideKernelPath);
-    kernelPath.append("\\System32\\ntoskrnl.exe");
+    ds2::Utils::SNPrintf(versionStr, sizeof(versionStr), "%lu.%lu",
+                         version.dwMajorVersion, version.dwMinorVersion);
   }
 
-error:
-  return kernelPath.c_str();
+  return versionStr;
 }
 
 bool Platform::GetUserName(UserId const &uid, std::string &name) {

Support/Testing/Excluded/ds2/android-x86_64.excluded

@@ -47,7 +47,6 @@ TestNonStop.LldbGdbServerTestCase.test_vCont_then_stop_llgs
 TestNonStop.LldbGdbServerTestCase.test_vCtrlC_llgs
 TestPartialResume.TestPartialResume.test_vCont_cxcx_llgs
 TestPartialResume.TestPartialResume.test_vCont_cxcxt_llgs
-TestPlatformCommand.PlatformCommandTestCase.test_status
 TestProcessAttach.ProcessAttachTestCase.test_attach_to_process_by_id
 TestProcessAttach.ProcessAttachTestCase.test_attach_to_process_by_id_autocontinue
 TestProcessAttach.ProcessAttachTestCase.test_attach_to_process_by_id_correct_executable_offset