Don't pick up version string from parent git repository

If the collectd source is extracted from a tarball underneath a
directory structure that includes another git repository, that
repository will be picked up by "git describe" which is not
desirable. Check whether collectd itself is a git repository and just
use the default version if not.

Upstream-Status: Pending

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

diff --git a/version-gen.sh b/version-gen.sh
index b09be8e..2671066 100755
--- a/version-gen.sh
+++ b/version-gen.sh
@@ -2,8 +2,10 @@
 
 DEFAULT_VERSION="5.5.0.git"
 
-VERSION="`git describe 2> /dev/null | grep collectd | sed -e 's/^collectd-//'`"
-
+VERSION=""
+if test -d .git ; then
+	VERSION="`git describe 2> /dev/null | grep collectd | sed -e 's/^collectd-//'`"
+fi
 if test -z "$VERSION"; then
 	VERSION="$DEFAULT_VERSION"
 fi