CMake: Don't use /NODEFAULTLIB on Windows unless we're Visual Studio.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d1c0815..c13f4e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1256,7 +1256,7 @@
   set (BUILD_SHARED_LIBS FALSE)
   add_library(SDL2-static STATIC ${SOURCE_FILES})
   set_target_properties(SDL2-static PROPERTIES OUTPUT_NAME "SDL2")
-  if(WINDOWS)
+  if(MSVC)
     set_target_properties(SDL2-static PROPERTIES LINK_FLAGS_RELEASE "/NODEFAULTLIB")
     set_target_properties(SDL2-static PROPERTIES LINK_FLAGS_DEBUG "/NODEFAULTLIB")
     set_target_properties(SDL2-static PROPERTIES STATIC_LIBRARY_FLAGS "/NODEFAULTLIB")