path: drop git_pathdup() in favor of repo_git_path()

Remove `git_pathdup()` in favor of `repo_git_path()`. The latter does
essentially the same, with the only exception that it does not rely on
`the_repository` but takes the repo as separate parameter.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-backend.c

@@ -183,7 +183,7 @@ static void send_strbuf(struct strbuf *hdr,
 static void send_local_file(struct strbuf *hdr, const char *the_type,
 				const char *name)
 {
-	char *p = git_pathdup("%s", name);
+	char *p = repo_git_path(the_repository, "%s", name);
 	size_t buf_alloc = 8192;
 	char *buf = xmalloc(buf_alloc);
 	int fd;