Merge pull request #550 from warmenhoven/warmenhoven/pr/ios-arch

libretro: ios/tvos builds shouldn't build x86_64

Author: skylersaleh

CMakeLists.txt

@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.15) # Needed to set MSVC Runtime type
-set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64" CACHE STRING "" FORCE)
+if(NOT DEFINED CMAKE_OSX_ARCHITECTURES)
+  set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64" CACHE STRING "")
+endif()
 
 if(APPLE AND (NOT IOS) AND (NOT ANDROID))
   set(MACOS 1)