contrib: xml2: fix for windows store

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/libxml2/win32.patch

@@ -18,3 +18,14 @@
        xmlWrapStat = xmlWrapStatUtf8;
        xmlWrapOpen = xmlWrapOpenUtf8;
  #ifdef HAVE_ZLIB_H
+--- libxml2/configure.in.orig	2013-08-15 11:40:51.228070119 +0200
++++ libxml2/configure.in	2013-08-15 11:41:01.956070564 +0200
+@@ -968,7 +968,7 @@
+        *mingw32*) if test "$with_threads" != "pthread" && test "$with_threads" != "no"; then
+                WITH_THREADS="1"
+                THREADS_W32="1"
+-               THREAD_CFLAGS="$THREAD_CFLAGS -DHAVE_WIN32_THREADS"
++               THREAD_CFLAGS="$THREAD_CFLAGS -DHAVE_WIN32_THREADS -DHAVE_COMPILER_TLS"
+            fi
+        ;;
+     esac