lib/commit: Make -path commit helper API private

It's no longer called directly by the pull code, so make it static.

The goal here is to have the pull and local-fs commit paths use higher level
more efficient APIs, and eventually make those APIs public.

Closes: #1257
Approved by: jlebon

src/libostree/ostree-repo-private.h

@@ -365,14 +365,6 @@ _ostree_repo_commit_tmpf_final (OstreeRepo        *self,
                                 GCancellable      *cancellable,
                                 GError           **error);
 
-gboolean
-_ostree_repo_commit_path_final (OstreeRepo        *self,
-                                const char        *checksum,
-                                OstreeObjectType   objtype,
-                                OtCleanupUnlinkat *tmp_path,
-                                GCancellable      *cancellable,
-                                GError           **error);
-
 gboolean
 _ostree_repo_open_content_bare (OstreeRepo          *self,
                                 const char          *checksum,