[FYI] Deleted branch 'mh-vala-support'

[Stefano Lattarini]

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