Allow py-compile to ignore DESTDIR

[Toshio]

Hi,

I've been building RPMS of my python program and found that py-compile
is encoding the value of DESTDIR into the byte-compiled .pyc and .pyo
files.  I put together this small patch to py-compile and python.am to
solve this.  It creates a --destdir [DIR] option to py-compile that
complements --basedir.  Using --basedir specifies an additional path
that is encoded on the beginning of the filenames whereas --destdir
specifies an additional path to tack on the front of the filenames only
for the purpose of finding the file to compile.

So the following invocations of py-compile have the following results:

Command:                          Search dir:    Filename in pyc/pyo:
py-compile try.py                      ./try.py            try.py
py-compile --destdir /tmp/qa try.py    /tmp/qa/try.py      try.py
py-compile --basedir /usr/share/qa try.py
                         /usr/share/qa/try.py /usr/share/qa/try.py
py-compile --destdir /tmp/qa --basedir /usr/share/qa try.py
                         /tmp/qa/try.py       /usr/share/qa/try.py

This is not entirely as expected as the third example has --basedir
change where the file is searched for as well as the encoding that goes
in the byte compiled file.  However, it's how py-compile currently
operates with the --basedir argument.

What are people's thoughts on this?  Is it worthwhile to continue
working on this?  Is it better that --basedir by itself works the same
as previous versions or should it only change the encoded file path?

-Toshio
-- 
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  t  o  s  h  i  o  +  t  i  k  i  -  l  o  u  n  g  e  .  c  o  m
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