hamsterdb: Update and set fixed revision number in recipe

Not having SRCREV resulted in contacting github during parse, so put a
fixed version in the recipe. Also fixup the version number.
It isn't being used currently.
gst-plugin-libxt: Set fixed SRCREV

I have no idea what this does, but it hasn't changed since 2012 so fix
its revision to prevent accessing the net while parsing this recipe.
Fix bblayers.conf generation
Merge branch 'master' of git://git.code.sf.net/p/openpli/openpli-oe-core