The 'git describe' command finds the most recent tag instead of the
SHA1. When trying to build from a repository without any tags, for
example in a fork, this causes the build to fail.
Use the '--always' option to fallback to the SHA1 in case no tag is
present.
Signed-off-by: Jef Driesen <jef@libdivecomputer.org>
19dd25c71c