libxaw: bump PR to disable xmlto

* meta-oe now provides xmlto-native
  http://git.openembedded.org/meta-openembedded/commit/?id=ab8f876ca8fa223c183e3db2029cce88f3435a27
  but not the stylesheets for buildhosts without them it's unusable and fails, because xorg macros
  autodetecting xmlto available, see:
  http://lists.linuxtogo.org/pipermail/openembedded-devel/2011-December/037066.html


  after adding xmlto-native and stylesheets-native to DEPENDS we can enable it again

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>