adding additional config options for hppa and ppc64

Both platforms failing on running xpcshell.

<jemalloc>: (malloc) Error in munmap():
Traceback (most recent call last):
  File "/«PKGBUILDDIR»/mozilla/toolkit/mozapps/installer/packager.py", line 402, in <module>
    main()
  File "/«PKGBUILDDIR»/mozilla/toolkit/mozapps/installer/packager.py", line 394, in main
    args.source, gre_path, base)
  File "/«PKGBUILDDIR»/mozilla/toolkit/mozapps/installer/packager.py", line 158, in precompile_cache
    errors.fatal('Error while running startup cache precompilation')
  File "/«PKGBUILDDIR»/mozilla/python/mozbuild/mozpack/errors.py", line 101, in fatal
    self._handle(self.FATAL, msg)
  File "/«PKGBUILDDIR»/mozilla/python/mozbuild/mozpack/errors.py", line 96, in _handle
    raise ErrorMessage(msg)
mozpack.errors.ErrorMessage: Error: Error while running startup cache precompilation

Other distributions fixing this error by disabling the optimization so doing
it so for hppa and ppc64.