VS/Android: Set API level explicitly during compiler identification

VS2022 defaults to API 31 in 64-bit builds.  This breaks if you combine
VS2022 with an older Android NDK.

Modules/CMakeDetermineCompilerId.cmake

@@ -345,6 +345,7 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
     set(id_platform ${CMAKE_VS_PLATFORM_NAME})
     set(id_lang "${lang}")
     set(id_PostBuildEvent_Command "")
+    set(id_api_level "")
     if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "^[Ll][Ll][Vv][Mm](_v[0-9]+(_xp)?)?$")
       set(id_cl_var "ClangClExecutable")
     elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "^[Cc][Ll][Aa][Nn][Gg]([Cc][Ll]$|_[0-9])")
@@ -430,6 +431,7 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
       set(id_system "")
     endif()
     if(id_keyword STREQUAL "Android")
+      set(id_api_level "<AndroidAPILevel>android-${CMAKE_SYSTEM_VERSION}</AndroidAPILevel>")
       if(CMAKE_GENERATOR MATCHES "Visual Studio 14")
         set(id_system_version "<ApplicationTypeRevision>2.0</ApplicationTypeRevision>")
       elseif(CMAKE_GENERATOR MATCHES "Visual Studio 1[567]")

Modules/CompilerId/VS-10.vcxproj.in

@@ -26,6 +26,7 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|@id_platform@'" Label="Configuration">
     <ConfigurationType>@id_config_type@</ConfigurationType>
     @id_toolset@
+    @id_api_level@
     <CharacterSet>MultiByte</CharacterSet>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />