build.ps1: clean up BUILD_WITH_INSTALL_RPATH usage

This is not necessary. This would only be needed for ELF targets which
are able to be built properly with `chrpath` once you set the
`CMAKE_EXECUTABLE_FORMAT` property.

Author: compnerd

utils/build.ps1

@@ -2792,7 +2792,6 @@ function Build-XCTest([Hashtable] $Platform) {
     -SwiftSDK (Get-SwiftSDK $Platform.OS) `
     -Defines @{
       BUILD_SHARED_LIBS = "YES";
-      CMAKE_BUILD_WITH_INSTALL_RPATH = "YES";
       CMAKE_INSTALL_BINDIR = $Platform.BinaryDir;
       ENABLE_TESTING = "NO";
       dispatch_DIR = $(Get-ProjectCMakeModules $Platform Dispatch);
@@ -2816,7 +2815,6 @@ function Test-XCTest {
       -SwiftSDK $null `
       -BuildTargets default,check-xctest `
       -Defines @{
-        CMAKE_BUILD_WITH_INSTALL_RPATH = "YES";
         CMAKE_Swift_FLAGS = @("-resource-dir", $SwiftRuntimeDirectory, "-vfsoverlay", "${RuntimeBinaryCache}\stdlib\windows-vfs-overlay.yaml");
         ENABLE_TESTING = "YES";
         dispatch_DIR = $(Get-ProjectCMakeModules $BuildPlatform Dispatch);
@@ -2839,7 +2837,6 @@ function Build-Testing([Hashtable] $Platform) {
     -SwiftSDK (Get-SwiftSDK $Platform.OS) `
     -Defines @{
       BUILD_SHARED_LIBS = "YES";
-      CMAKE_BUILD_WITH_INSTALL_RPATH = "YES";
       CMAKE_INSTALL_BINDIR = $Platform.BinaryDir;
       dispatch_DIR = (Get-ProjectCMakeModules $Platform Dispatch);
       Foundation_DIR = (Get-ProjectCMakeModules $Platform DynamicFoundation);