Do not match lightweight tags in git-version-gen

Fix leftover from 175b517 which added
matching of lightweight git tags.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

build-aux/git-version-gen

@@ -169,8 +169,8 @@ then
 # directory, and "git describe" output looks sensible, use that to
 # derive a version string.
 elif test "`git log -1 --pretty=format:x . 2>&1`" = x \
-    && v=`git describe --abbrev=4 --match="$prefix*" --tags HEAD 2>/dev/null \
-          || git describe --abbrev=4 --tags HEAD 2>/dev/null` \
+    && v=`git describe --abbrev=4 --match="$prefix*" HEAD 2>/dev/null \
+          || git describe --abbrev=4 HEAD 2>/dev/null` \
     && v=`printf '%s\n' "$v" | sed "$tag_sed_script"` \
     && case $v in
          $prefix[0-9]*) ;;