.gitignore: Add aur-git/ and git-interface/git-auth.sh

Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

.gitignore

@@ -6,3 +6,5 @@ po/POTFILES
 scripts/git-integration/__pycache__/
 scripts/git-integration/templates/
 web/locale/*/
+aur.git/
+git-interface/git-auth.sh