Use libglnx

Starting down the path of not using libgsystem.  The main win here
will be code sharing between ostree/rpm-ostree as well as going down
the path of not using GFile * for local files.

.gitignore

@@ -1,6 +1,7 @@
 # Standard C/Automake goo
 .deps
 .libs
+.dirstamp
 *.typelib
 *.la
 *.lo