git-config fileEncoding

Accept arbitrarily encoded repository filepaths etc when reading git config
output. This fixes support for remotes with unusual characters in their
names.

For example, a remote with a url of /tmp/çüş was previously
skipped, because the filename wasn't encoded right so it didn't think it
was available. And when setting the annex-uuid of a remote named "çüş",
it used to add it under a mis-encoded form of the remote's name. Both these
cases now work ok in my testing.

Git/Config.hs

@@ -54,6 +54,10 @@ read' repo = go repo
 {- Reads git config from a handle and populates a repo with it. -}
 hRead :: Repo -> Handle -> IO Repo
 hRead repo h = do
+	-- We use the FileSystemEncoding when reading from git-config,
+	-- because it can contain arbitrary filepaths (and other strings)
+	-- in any encoding.
+	fileEncoding h
 	val <- hGetContentsStrict h
 	store val repo