cmake: disable precompiled header for SDL_spinlock.c when targeting Android

This fixes the following error:
error: PCH file was compiled for the target 'thumbv7-none-linux-android16' but the current translation unit is being compiled for target 'armv7-none-linux-android16'

CMakeLists.txt

@@ -1211,6 +1211,7 @@ if(ANDROID)
   cmake_pop_check_state()
   if(HAVE_ARM_MODE)
     set_property(SOURCE "${SDL3_SOURCE_DIR}/src/atomic/SDL_spinlock.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -marm")
+    set_source_files_properties(src/atomic/SDL_spinlock.c PROPERTIES SKIP_PRECOMPILE_HEADERS 1)
   endif()
 
   if(SDL_AUDIO)