pull: fix GLNX_HASH_TABLE_FOREACH_KV regressions

These are regression from #971. We were stuffing a pointer size inside a
variable of integer size. So the assignment was spilling over into other
variables' storage space. Actually use a gpointer and GPOINTER_TO_[U]INT
as was done originally.

Also bump libglnx which has static checks for this error in the future.

Update submodule: libglnx

Closes: #990
Approved by: cgwalters

src/libostree/ostree-repo-pull.c

@@ -4948,8 +4948,10 @@ ostree_repo_pull_from_remotes_async (OstreeRepo                           *self,
 
   /* Any refs left un-downloaded? If so, we’ve failed. */
   GLNX_HASH_TABLE_FOREACH_KV (refs_pulled, const OstreeCollectionRef*, ref,
-                                           gboolean, is_pulled)
+                                           gpointer, is_pulled_pointer)
     {
+      gboolean is_pulled = GPOINTER_TO_INT (is_pulled_pointer);
+
       if (is_pulled)
         continue;