contrib: vpx: drop obsolete patch

contrib/src/vpx/rules.mak

@@ -11,7 +11,6 @@ $(TARBALLS)/libvpx-$(VPX_VERSION).tar.bz2:
 libvpx: libvpx-$(VPX_VERSION).tar.bz2 .sum-vpx
 	$(UNPACK)
 	$(APPLY) $(SRC)/vpx/libvpx-no-cross.patch
-	$(APPLY) $(SRC)/vpx/windows.patch
 	$(APPLY) $(SRC)/vpx/libvpx-mac.patch
 	$(MOVE)
 

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>