[truetype] Always check the checksum to identify tricky fonts.

Some PDF generators mangle the family name badly, prioritize
the check by the sfnt table checksums than the check by the
family name.  For sample PDF, see
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00073.html

* src/truetype/ttobjs.c (tt_check_trickyness): Exchange the order
of tt_check_trickyness_family() and tt_check_trickyness_sfnt_ids().
2 files changed