Log function prettyprint on os x sure is verbose
On Linux, my debug-level log says things like
```
Jul 12 12:19:17.904 [debug] choose_good_middle_server(): Contemplating intermediate hop 1: random choice.
```
I just saw a debug level log from osx, and it said
```
Jul 12 11:45:54.528 [debug] const node_t *choose_good_middle_server(uint8_t, cpath_build_state_t *, crypt_path_t *, int): Contemplating intermediate hop 1: random choice.
```
Wow! Is that level of detail really desired?
issue