Fixed the include path for khronos with Visual Studio

CMakeLists.txt

@@ -233,7 +233,11 @@ endif()
 add_definitions(-DUSING_GENERATED_CONFIG_H)
 # General includes
 include_directories(${SDL2_BINARY_DIR}/include ${SDL2_SOURCE_DIR}/include)
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter ${SDL2_SOURCE_DIR}/src/video/khronos")
+if(USE_GCC OR USE_CLANG)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter ${SDL2_SOURCE_DIR}/src/video/khronos")
+else()
+  include_directories(${SDL2_SOURCE_DIR}/src/video/khronos)
+endif()
 
 # All these ENABLED_BY_DEFAULT vars will default to ON if not specified, so
 #  you only need to have a platform override them if they are disabling.