Remove old mingw hacks so that composer++ will build with currently recommended mingw tools.

Thanks to David King <d_king@xtra.co.nz> for the patch.
Bug #220978 r=cls

composer/app/module.rc

@@ -107,9 +107,7 @@ IDD_SPLASH DIALOGEX
 	FONT 8, "MS Sans Serif"
 	BEGIN
 		CONTROL
-#ifndef __MINGW32__
-            IDB_SPLASH,
-#endif
+                  IDB_SPLASH,
 			IDB_SPLASH,
 			"Static",
 			SS_BITMAP,

composer/app/splash.rc

@@ -62,9 +62,7 @@ IDD_SPLASH DIALOGEX
 	FONT 8, "MS Sans Serif"
 	BEGIN
 		CONTROL
-#ifndef __MINGW32__
-            IDB_SPLASH,
-#endif
+            	IDB_SPLASH,
 			IDB_SPLASH,
 			"Static",
 			SS_BITMAP,