Removed #include of wingdi.h and windef.h from winuser.h (and resolved
the resulting compilation failures).

diff --git a/loader/main.c b/loader/main.c
index f146cc3..b2457f3 100644
--- a/loader/main.c
+++ b/loader/main.c
@@ -2,6 +2,7 @@
  * Main initialization code
  */
 
+#include <assert.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -9,7 +10,8 @@
 #include <unistd.h>
 #include <string.h>
 #include <errno.h>
-#include <assert.h>
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/winbase16.h"
 #include "wine/winuser16.h"
 #include "bitmap.h"