Add some mirroring defines.

include/wingdi.h

diff --git a/include/wingdi.h b/include/wingdi.h
index 5267636..eab43f9 100644
--- a/include/wingdi.h
+++ b/include/wingdi.h
@@ -3199,6 +3199,12 @@
 #define FR_PRIVATE  0x10
 #define FR_NOT_ENUM 0x20
 
+/* Mirroring flags */
+#define LAYOUT_LTR                         0x00000000
+#define LAYOUT_RTL                         0x00000001
+#define LAYOUT_BITMAPORIENTATIONPRESERVED  0x00000008
+#define NOMIRRORBITMAP                     0x80000000
+
 
 INT         WINAPI AbortDoc(HDC);
 BOOL        WINAPI AbortPath(HDC);