CMake: Replace CMAKE_APPLE_SILICON_PROCESSOR

Use CMAKE_HOST_SYSTEM_PROCESSOR instead, which can be set by
CMAKE_APPLE_SILICON_PROCESSOR anyways.

Signed-off-by: Avery King <avery98@pm.me>

CMakeLists.txt

@@ -43,7 +43,7 @@ if(VCPKG)
   else()
     if(NOT DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
       if(APPLE)
-         if(CMAKE_APPLE_SILICON_PROCESSOR MATCHES "arm64") # Apple Silicon
+	 if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "arm64") # Apple Silicon
             set(VCPKG_TARGET_TRIPLET "arm64-osx-dynamic")
          else() # Intel
             set(VCPKG_TARGET_TRIPLET "x64-osx-dynamic")