[bdf] Add more error messages. * src/bdf/bdflib.c (_bdf_set_default_spacing, _bdf_add_property): Add line number argument. Update all callers. (ERRMSG5, ERRMSG6, ERRMSG7, ERRMSG8, ERRMSG9): New macros. (_bdf_readstream, _bdf_set_default_spacing, _bdf_add_property, _bdf_parse_glyphs, _bdf_parse_start): Add error messages.