LIBGD: Add missing macros from libgd/libgd/f4bc1f5

Author: Matthias Goerges

libraries/libgd/flip_macro.patch

@@ -0,0 +1,15 @@
+--- src/gd.h
++++ src/gd.h
+@@ -1604,6 +1604,11 @@ BGD_DECLARE(void) gdImageFlipHorizontal(gdImagePtr im);
+ BGD_DECLARE(void) gdImageFlipVertical(gdImagePtr im);
+ BGD_DECLARE(void) gdImageFlipBoth(gdImagePtr im);
+ 
++#define GD_FLIP_HORINZONTAL 1 /* typo, kept for BC */
++#define GD_FLIP_HORIZONTAL 1
++#define GD_FLIP_VERTICAL 2
++#define GD_FLIP_BOTH 3
++
+ /**
+  * Group: Crop
+  *
+