prop224: Clang compile error + bad log_warn on master

Seems like we failed a bit on the latest merges and we introduced a compile error:

In file included from src/or/directory.c:21: 
src/or/directory.h:191: error: redefinition of typedef ‘response_handler_args_t’
src/or/directory.h:181: note: previous declaration of ‘response_handler_args_t’ was here

and also a stray and loud log_warn:

[warn] No change in hsdir set!

We need to fix these!