Update to pidgin-2.10.11.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk@15006 af4574ff-66df-0310-9fd7-8a98e5e911e0
add xdg-utils to pidgin dependencies

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk@15007 af4574ff-66df-0310-9fd7-8a98e5e911e0