contrib: vpx: missing header

(cherry picked from commit e3d6ee99c60ef86979b8edd07149cfe9d9e1a6e3)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/vpx/rules.mak

@@ -18,6 +18,7 @@ libvpx: libvpx-$(VPX_VERSION).tar.bz2 .sum-vpx
 	$(UNPACK)
 	$(APPLY) $(SRC)/vpx/libvpx-no-cross.patch
 	$(APPLY) $(SRC)/vpx/libvpx-no-abi.patch
+	$(APPLY) $(SRC)/vpx/windows.patch
 ifdef HAVE_MACOSX
 	$(APPLY) $(SRC)/vpx/libvpx-mac.patch
 	$(APPLY) $(SRC)/vpx/libvpx-mac-mountain-lion.patch

contrib/src/vpx/windows.patch

+--- libvpx/vp8/common/generic/systemdependent.c.orig	2013-03-13 01:01:48.404990528 +0100
++++ libvpx/vp8/common/generic/systemdependent.c	2013-03-13 01:02:35.928991544 +0100
+@@ -18,6 +18,10 @@
+ #endif
+ #include "vp8/common/onyxc_int.h"
+ 
++#if defined(_WIN32)
++# include <windows.h>
++#endif
++
+ #if CONFIG_MULTITHREAD
+ #if HAVE_UNISTD_H && !defined(__OS2__)
+ #include <unistd.h>