build-aux/git-version-gen: Ignore timestamps.

Do not declare the working tree dirty if only a timestamp has changed.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

build-aux/git-version-gen

@@ -10,6 +10,7 @@ VERFILE="$1"
 
 if [ -d '.git' ]
 then
+  git update-index --refresh > /dev/null 2>&1
   VERSION=`git describe --abbrev=4 --match='v[0-9]*' --dirty 2>/dev/null`
   VERSION=`echo "$VERSION" | sed 's/^v//'`
   [ -n "$VERSION" ] && echo -n "$VERSION" > "$VERFILE"