Add definition for the TT_Postscript table.
Add definition for the TT_Postscript table.

This is a purely mechanical change that follows the pattern used by the
existing definition for the TT_OS2 table.

PistonDevelopers/freetype-sys,PistonDevelopers/freetype-sys,bvssvni/freetype-sys,bvssvni/freetype-sys,PistonDevelopers/freetype-sys,PistonDevelopers/freetype-sys,bvssvni/freetype-sys,bvssvni/freetype-sys,PistonDevelopers/freetype-sys,bvssvni/freetype-sys,PistonDevelopers/freetype-sys,bvssvni/freetype-sys,bvssvni/freetype-sys,PistonDevelopers/freetype-sys,PistonDevelopers/freetype-sys,bvssvni/freetype-sys