Tell Git not to export the GitSetup directory

bradking · bradking · commit 55ed2f72b101 · 2017-10-19T08:21:05.000-04:00
The `Utilities/GitSetup` directory is useful only in Git work trees
and so does not need to be distributed with source tarballs.
diff --git a/Utilities/.gitattributes b/Utilities/.gitattributes
@@ -0,0 +1 @@
+/GitSetup               export-ignore
