VPX: try to fix mountain lion patch

contrib/src/vpx/libvpx-mac-mountain-lion.patch

---- libvpx/build/make/gen_asm_deps.sh.orig	2012-07-18 23:43:18.000000000 +0200
-+++ libvpx.patched/build/make/gen_asm_deps.sh	2012-07-18 23:45:52.000000000 +0200
+--- libvpx/build/make/gen_asm_deps.sh.orig	2013-03-13 01:39:54.000000000 +0100
++++ libvpx/build/make/gen_asm_deps.sh	2013-03-13 01:41:41.000000000 +0100
 @@ -42,7 +42,7 @@
  
  [ -n "$srcfile" ] || show_help
  sfx=${sfx:-asm}
--includes=$(egrep -i "include +\"?+[a-z0-9_/]+\.${sfx}" $srcfile |
-+includes=$(egrep -i "include +\"?[a-z0-9_/]+\.${sfx}" $srcfile |
+-includes=$(LC_ALL=C egrep -i "include +\"?+[a-z0-9_/]+\.${sfx}" $srcfile |
++includes=$(LC_ALL=C egrep -i "include +\"?[a-z0-9_/]+\.${sfx}" $srcfile |
             perl -p -e "s;.*?([a-z0-9_/]+.${sfx}).*;\1;")
  #" restore editor state
  for inc in ${includes}; do