[Mono-osx] libgdiplus build failure on 10.3

[Benjamin Reed]

---(snip!)---
 gcc -DHAVE_CONFIG_H -I. -I. -I..
-I/fink/lib/freetype219/include/freetype2
-I/fink/lib/freetype219/include -I/fink/include/cairo
-I/fink/include/glib-2.0 -I/fink/lib/glib-2.0/include
-I/fink/lib/freetype219/include/freetype2
-I/fink/lib/freetype219/include -Wall -Wno-unused -Wno-format
-I/fink/lib/freetype219/include
-I/fink/lib/freetype219/include/freetype -I/fink/include
-I/usr/X11R6/include -no-cpp-precomp -g -O2 -c graphics.c  -fno-common
-DPIC -o .libs/graphics.o
graphics.c: In function `GdipCreateFromQuartz_macosx':
graphics.c:471: error: request for member `dpi_x' in something not a
structure or union
graphics.c:471: error: request for member `dpi_y' in something not a
structure or union
make[2]: *** [graphics.lo] Error 1
---(snip!)---

Looks like maybe some struct isn't what's expected?