core: Delete unused OstreeRepoFile API

Was just unused, and it was using further API i want to remove.

src/libostree/ostree-repo-file.c

@@ -368,17 +368,6 @@ ostree_repo_file_tree_get_metadata_checksum (OstreeRepoFile  *self)
   return self->tree_metadata_checksum;
 }
 
-/**
- * ostree_repo_file_nontree_get_local:
- *
- * Returns: (transfer full): The real loose #GFile backing this object
- */
-GFile *
-ostree_repo_file_nontree_get_local (OstreeRepoFile  *self)
-{
-  return _ostree_repo_get_file_object_path (self->repo, ostree_repo_file_get_checksum (self));
-}
-
 /**
  * ostree_repo_file_get_repo:
  * @self:

src/libostree/ostree-repo-file.h

@@ -74,8 +74,6 @@ const char * ostree_repo_file_get_checksum (OstreeRepoFile  *self);
 
 const char * ostree_repo_file_get_commit (OstreeRepoFile  *self);
 
-GFile *ostree_repo_file_nontree_get_local (OstreeRepoFile  *self);
-
 int     ostree_repo_file_tree_find_child  (OstreeRepoFile  *self,
                                             const char      *name,
                                             gboolean        *is_dir,