[MacPorts] #64677: libass fix for PowerPC

[MacPorts]

#64677: libass fix for PowerPC
-----------------------------------+--------------------
 Reporter:  barracuda156           |      Owner:  (none)
     Type:  enhancement            |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.7.1
 Keywords:  PowerPC, ppc, Leopard  |       Port:  libass
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 1. Portfile must invoke `macports-gcc-7`, as `gcc-4.2` fails to build it.
 Adding this works:

 {{{
 compiler.whitelist macports-gcc-7
 }}}

 Otherwise (and perhaps better) we can just ban `gcc-4.0` and `gcc-4.2`.

 2. There is one problem with the source in `ass_coretext.c`:

 {{{
 static bool is_postscript_font_format(CFNumberRef cfformat)
 {
     bool ret = false;
     int format;
     if (CFNumberGetValue(cfformat, kCFNumberIntType, &format)) {
         ret = format == kCTFontFormatOpenTypePostScript ||
               format == kCTFontFormatPostScript;
     }
     return ret;
 }
 }}}

 Once kCTFontFormatOpenTypePostScript is removed, libass builds. I am not
 sure it is an optimal fix though.
 Opened a ticket here: https://github.com/libass/libass/issues/595

-- 
Ticket URL: <https://trac.macports.org/ticket/64677>
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