fonttosfnt 1.2.4

Alan Coopersmith (4):

• unifdef __UNIXOS2__ (!21 (merged))
• unifdef __SCO__ (!21 (merged))
• unifdef NEED_SNPRINTF (!21 (merged))
• fonttosfnt 1.2.4

Bernhard M. Wiedemann (2):

• Use long long for timestamp diff (!22 (merged))
• Allow to override build date with SOURCE_DATE_EPOCH (!22 (merged))

Jan Friesse (1):

• Use FONT_UNITS_FLOOR for ascent/descent (#7 (closed), !18 (merged))

philg314 (1):

• Fix cmap Subtable Format 4 entrySelector (!17 (merged))