The branch 'mh-vala-support' had been long ago merged into the development line that was the pre-1.11 'next', and that is into today's 'maint'; also, it hasn't been used nor developed for quite a long time now, the vala-relevant changes taking place directly in the maint branch or in temporary topic branches based off it.
So I've removed such 'mh-vala-support' branch. Regards, Stefano