[truetype] Recalculate the sfnt table checksum always. * src/truetype/ttobjs.c (tt_get_sfnt_checksum): Recalculate the sfnt table checksum even if non-zero value is writte in the TrueType font header. Some bad PDF generators write wrong values. For detail, see examples and benchmark tests of the latency by recalculation: http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00091.html http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00096.html