[EFL] Build break using jhbuild on ubuntu 13.04
https://bugs.webkit.org/show_bug.cgi?id=115225

Reviewed by Gyuyoung Kim.

libxslt in Ubuntu 13.04 requires libxml 2.9.0 or higher and
libxml 2.9.0 has a bug to make regression which r138422 mentioned.
So this patch bumped libxml version to 2.9.1.

* efl/jhbuild.modules:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149231 268f45cc-cd09-0410-ab3c-d52691b4dbfc