[jhbuild] Readd libxml2 patch

[Christophe Fergeau <teuf src gnome org>]

commit fa048c918256d462c83ecf95d7c1eb95bcf22dd7
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Wed May 23 13:18:02 2012 +0200

    Readd libxml2 patch
    
    I was too hasty in removing it, it's still used in the 3.4
    moduleset

 patches/libxml2-2.7.8-versioning.patch |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/patches/libxml2-2.7.8-versioning.patch b/patches/libxml2-2.7.8-versioning.patch
new file mode 100644
index 0000000..a65e416
--- /dev/null
+++ b/patches/libxml2-2.7.8-versioning.patch
@@ -0,0 +1,24 @@
+diff -ru libxml2-2.7.8/configure libxml2-2.7.8+versioning/configure
+--- libxml2-2.7.8/configure	2010-11-04 13:28:14.000000000 -0400
++++ libxml2-2.7.8+versioning/configure	2012-02-15 09:21:41.959278546 -0500
+@@ -11414,7 +11427,7 @@
+   esac
+ fi
+ 
+- if test -z "$VERSION_SCRIPT_FLAGS"; then
++ if test -n "$VERSION_SCRIPT_FLAGS"; then
+   USE_VERSION_SCRIPT_TRUE=
+   USE_VERSION_SCRIPT_FALSE='#'
+ else
+diff -ru libxml2-2.7.8/configure.in libxml2-2.7.8+versioning/configure.in
+--- libxml2-2.7.8/configure.in	2010-11-04 13:01:19.000000000 -0400
++++ libxml2-2.7.8+versioning/configure.in	2012-02-15 09:21:31.711278392 -0500
+@@ -84,7 +84,7 @@
+   esac
+ fi
+ AC_SUBST(VERSION_SCRIPT_FLAGS)
+-AM_CONDITIONAL([USE_VERSION_SCRIPT], [test -z "$VERSION_SCRIPT_FLAGS"])
++AM_CONDITIONAL([USE_VERSION_SCRIPT], [test -n "$VERSION_SCRIPT_FLAGS"])
+ 
+ dnl
+ dnl We process the AC_ARG_WITH first so that later we can modify