Merge branch 'ow/config-mailmap-pathname'

mailmap.file configuration names a pathname, hence should honor
~/path and ~user/path as its value.

* ow/config-mailmap-pathname:
  config: respect '~' and '~user' in mailmap.file

config.c

@@ -953,7 +953,7 @@ static int git_default_push_config(const char *var, const char *value)
 static int git_default_mailmap_config(const char *var, const char *value)
 {
 	if (!strcmp(var, "mailmap.file"))
-		return git_config_string(&git_mailmap_file, var, value);
+		return git_config_pathname(&git_mailmap_file, var, value);
 	if (!strcmp(var, "mailmap.blob"))
 		return git_config_string(&git_mailmap_blob, var, value);