Use mingw-std-threads in MinGW builds

modules/gdscript/gdscript_tokenizer.h

@@ -37,6 +37,12 @@
 #include "core/templates/vector.h"
 #include "core/variant/variant.h"
 
+#ifdef MINGW_ENABLED
+#undef CONST
+#undef IN
+#undef VOID
+#endif
+
 class GDScriptTokenizer {
 public:
 	enum CursorPlace {

modules/gltf/editor/editor_scene_importer_blend.cpp

@@ -45,6 +45,11 @@
 #include "main/main.h"
 #include "scene/gui/line_edit.h"
 
+#ifdef MINGW_ENABLED
+#define near
+#define far
+#endif
+
 #ifdef WINDOWS_ENABLED
 #include <shlwapi.h>
 #endif