Port get_version fix from mkit

setup/mk.sh

         local lasttag=$(git tag | grep ^v | sort -V | tail -n1)
         if ! git describe --tags --exact-match HEAD >&/dev/null;
         then    # we are not at later commit than the last tag
-            local sha=g$(git describe --always HEAD)
+            local sha=g$(git log -1 --pretty=format:%h HEAD)
         fi
         if test "$(git diff --shortstat 2>/dev/null)" != "";
         then    # thr tree is "dirty", i.e. has been edited