Kill vestigal dangling-remote code

Fixes #1232

include/git2/remote.h

@@ -60,7 +60,7 @@ GIT_EXTERN(int) git_remote_create(
  * See `git_tag_create()` for rules about valid names.
  *
  * @param out pointer to the new remote object
- * @param repo the associated repository. May be NULL for a "dangling" remote.
+ * @param repo the associated repository
  * @param fetch the fetch refspec to use for this remote. May be NULL for defaults.
  * @param url the remote repository's URL
  * @return 0 or an error code
@@ -72,16 +72,6 @@ GIT_EXTERN(int) git_remote_create_inmemory(
 		const char *url);
 
 /**
- * Sets the owning repository for the remote.  This is only allowed on
- * dangling remotes.
- *
- * @param remote the remote to configure
- * @param repo the repository that will own the remote
- * @return 0 or an error code
- */
-GIT_EXTERN(int) git_remote_set_repository(git_remote *remote, git_repository *repo);
-
-/**
  * Get the information for a particular remote
  *
  * The name will be checked for validity.

src/remote.c

@@ -195,19 +195,6 @@ int git_remote_create_inmemory(git_remote **out, git_repository *repo, const cha
 	return 0;
 }
 
-int git_remote_set_repository(git_remote *remote, git_repository *repo)
-{
-	assert(repo);
-
-	if (remote->repo) {
-		giterr_set(GITERR_INVALID, "Remotes can't change repositiories.");
-		return GIT_ERROR;
-	}
-
-	remote->repo = repo;
-	return 0;
-}
-
 int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 {
 	git_remote *remote;