Added code to fallback to Yosemite or pre-Yosemite system font in case current system font can't be found or is in an unusable format. San Francisco font used on current OS X versions is in a .otf file whih presumably means it has CFF outlines that stb_truetype can't use.

#ifndef PATHS_H_
#define PATHS_H_

void get_initial_browse_path(char **dst);
char *path_append(const char *base, const char *suffix);

#endif //PATHS_H_