[MacPerl] Fixed bugs

[Matthias Ulrich Neeracher <neeri@iis.ee.ethz.ch>]

As the release of 5.0.7 approaches (maybe next weekend) and the bug reports
are getting repetitive, here's an overview of what bugs I'm working on:

 - PowerPC and fat installations of MacPerl generate buggy runtimes (fixed).
 - Some operations on bit vectors only work the first time (fixed).
 - 68K MPW Tool crashes (reproduced but not fixed yet).

Matthias

-----
Matthias Neeracher <neeri@iis.ee.ethz.ch> http://err.ethz.ch/members/neeri.html
  "And that's why I am going to turn this world upside down, and make
   of it a fire so *bright* that someone real will notice"
                                -- Vernor Vinge, _Tatja Grimm's World_