build: Tolerate building from a git checkout, but with git not installed.
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Sat, 25 Nov 2017 14:07:31 +0000 (14:07 +0000)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Sat, 25 Nov 2017 14:07:37 +0000 (14:07 +0000)
This can happen in chroots.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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