automake: rework the git_sha1.h rule, include in tarball
As we'll need the file in the release tarball, rework the rule so that
the file is regenerated _only_ if we're in a git repository.
With this in place we can build vulkan (anv) from a release tarball.
Cc: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: Kristian Høgsberg Kristensen <krh@bitplanet.net>
Signed-off-by:
Emil Velikov <emil.velikov@collabora.com>
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