[patch?] Write Version.inc at cmake time, not at build time

[Nico Weber]

Hi,

I'm seeing a cmake invocation to generate Version.inc on every build, even
if nothing else needs to be done. r191784 claimed to undo that, but it
doesn't work for me – and as far as I understand, Version.inc is still
created through an always-dirty build edge at the moment, so I don't
understand how this couldn't run on every build either.

The attached patch changes things so that Version.inc is written at cmake
time. With this, I get empty builds that don't run any build steps.

Nico
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