* Also look for postprocess.h under libpostproc/

Upstream-status: Pending

Index: vlc-2.1.4/configure.ac
===================================================================
--- vlc-2.1.4.orig/configure.ac
+++ vlc-2.1.4/configure.ac
@@ -2444,7 +2444,7 @@ then
       VLC_SAVE_FLAGS
       CPPFLAGS="${CPPFLAGS} ${POSTPROC_CFLAGS}"
       CFLAGS="${CFLAGS} ${POSTPROC_CFLAGS}"
-      AC_CHECK_HEADERS(postproc/postprocess.h)
+      AC_CHECK_HEADERS(postproc/postprocess.h,[],[AC_CHECK_HEADERS(libpostproc/postprocess.h)])
       VLC_ADD_PLUGIN([postproc])
       VLC_ADD_LIBS([postproc],[$POSTPROC_LIBS $AVUTIL_LIBS])
       VLC_ADD_CFLAGS([postproc],[$POSTPROC_CFLAGS $AVUTIL_CFLAGS])