removed os2 support & support for building SDL with watcom.

test/testnative.c

@@ -32,9 +32,6 @@ static NativeWindowFactory *factories[] = {
 #endif
 #ifdef TEST_NATIVE_COCOA
     &CocoaWindowFactory,
-#endif
-#ifdef TEST_NATIVE_OS2
-    &OS2WindowFactory,
 #endif
     NULL
 };