[cmake] enable clang-cl and WoA builds (#348)

Compilation and CMake fixes for both Windows on ARM and clang-cl, meaning Windows can now be built on both MSVC and clang on both amd64 and aarch64.

Compiling on clang is *dramatically* faster so this should be useful for CI.

Co-authored-by: crueter <crueter@eden-emu.dev>
Co-authored-by: crueter <crueter@crueter.xyz>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/348
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/common/CMakeLists.txt

@@ -237,7 +237,7 @@ else()
   )
 
   # Get around GCC failing with intrinsics in Debug
-  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_BUILD_TYPE MATCHES "Debug")
+  if(CXX_GCC AND CMAKE_BUILD_TYPE MATCHES "Debug")
     set_property(
       SOURCE stb.cpp
       APPEND
@@ -245,7 +245,7 @@ else()
   endif()
 endif()
 
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+if(CXX_CLANG)
   target_compile_options(common PRIVATE -fsized-deallocation
                                         -Werror=unreachable-code-aggressive)
   target_compile_definitions(