[merge] look for plugins in arch-independent site directory (was Re: Bundling more plugins into bzrtools)

[Alexander Belchenko]

Martin Pool пишет:
>>  > But
>>  > better would be a fairly trivial patch to bzrlib.plugin to
>>  > add /usr/lib/pythonX.Y/site-packages/bzrlib/plugins to the default
>>  > path.
>>  >
>>
>>
>> Excellent!  Patch against 1.2rc1 and tested with bzr-1.1 attached.

bb:resubmit

I'm sure I don't need such path modification under Windows.