librsvg: upgrade to 2.40.0

librsvg: upgrade to 2.40.0

Add local-m4.patch and install a local vapigen.m4 so that we can autoreconf
without needing Vala installed.

Refresh build dependencies removing stale recipes and adding libcroco as it's a mandatory dependency now.

Explicitly disable Vala, with a patch from upstream until 2.40.1.

The GTK+ 2 theme engine has been removed, delete all traces of it.

Add a patch to make GTK+ use deterministic, and a disabled PACKAGECONFIG for it.

Enable parallel make, as some testing shows that it works fine.

Drop librsvg-CVE-2011-3146, merged upstream.  Drop doc_Makefile.patch, our
gtk-doc.mk isn't buggy and this isn't needed anymore.

Merge multiple -dev and -dbg packages into ${PN}-dev and -dbg, and remove the
loader module .a and .la files as they are pointless.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>