[Merge] lp:~khurshid-alam/hud/fix-build-vala into lp:hud

[Khurshid Alam]

Khurshid Alam has proposed merging lp:~khurshid-alam/hud/fix-build-vala into lp:hud.

Commit message:
Fix build against vala >= 0.48.x

Requested reviews:
  Sebastien Bacher (seb128)

For more details, see:
https://code.launchpad.net/~khurshid-alam/hud/fix-build-vala/+merge/380696

This is now compiling on proposed https://code.launchpad.net/~unity7maintainers/+archive/ubuntu/unity7-desktop-proposed/+build/18837148
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