Define NONAMELESS{STRUCT,UNION} explicitly in the files that need them.

diff --git a/dlls/wineps/init.c b/dlls/wineps/init.c
index fa6e9da..5b8c000 100644
--- a/dlls/wineps/init.c
+++ b/dlls/wineps/init.c
@@ -27,6 +27,8 @@
 # include <unistd.h>
 #endif
 
+#define NONAMELESSUNION
+#define NONAMELESSSTRUCT
 #include "gdi.h"
 #include "psdrv.h"
 #include "wine/debug.h"