[cxx-interop] Do not install binary .swiftmodule files for the overlays

This fixes a deserialization failure in the compiler that occurred while loading the CxxStdlib overlay module:
```
Cross-reference to module 'Swift'
... Optional
... some
... with type <τ_0_0 where τ_0_0 : ~Copyable, τ_0_0 : ~Escapable> (Optional<τ_0_0>.Type) -> (τ_0_0) -> Optional<τ_0_0>
```

This was happening because the overlays were built against a different version of the Swift stdlib than is being used. The compiler is able to rebuild the Cxx and CxxStdlib modules from their textual interfaces. Let's use that feature unconditionally in production toolchains to avoid this kind of binary incompatibilities.

rdar://150416863

Author: egorzhdan

stdlib/cmake/modules/SwiftSource.cmake

@@ -749,7 +749,9 @@ function(_compile_swift_files
     endif()
 
     set(exclude_binary_swiftmodule_installation_args "")
-    if(NOT SWIFTFILE_INSTALL_BINARY_SWIFTMODULE)
+    if(NOT SWIFTFILE_INSTALL_BINARY_SWIFTMODULE OR
+       (SWIFTFILE_INSTALL_BINARY_SWIFTMODULE STREQUAL "NON_DARWIN_ONLY" AND
+        SWIFTFILE_SDK IN_LIST SWIFT_DARWIN_PLATFORMS))
         list(APPEND
           exclude_binary_swiftmodule_installation_args
           "REGEX" "${SWIFTFILE_MODULE_NAME}.swiftmodule/[^/]*\\.swiftmodule$" EXCLUDE)

stdlib/public/Cxx/CMakeLists.txt

@@ -39,6 +39,7 @@ add_swift_target_library(swiftCxx STATIC NO_LINK_NAME IS_STDLIB IS_SWIFT_ONLY
     DEPENDS ${SWIFT_CXX_DEPS}
     MACCATALYST_BUILD_FLAVOR zippered
     INSTALL_IN_COMPONENT compiler
+    INSTALL_BINARY_SWIFTMODULE NON_DARWIN_ONLY
     INSTALL_WITH_SHARED)
 
 add_subdirectory(libstdcxx)

stdlib/public/Cxx/std/CMakeLists.txt

@@ -81,5 +81,6 @@ add_swift_target_library(swiftCxxStdlib STATIC NO_LINK_NAME IS_STDLIB IS_SWIFT_O
     TARGET_SDKS ALL_APPLE_PLATFORMS LINUX WINDOWS ANDROID
     MACCATALYST_BUILD_FLAVOR zippered
     INSTALL_IN_COMPONENT compiler
+    INSTALL_BINARY_SWIFTMODULE NON_DARWIN_ONLY
     INSTALL_WITH_SHARED
     DEPENDS libstdcxx-modulemap libcxxshim_modulemap CxxStdlib-apinotes)