This reverts those parts of commit f892f979
that add .dylib as an extension for native Python modules, which in turn was
obsoleted by 2ea723e8 "Revert 'Mac OS X uses
.dylib and not .so for python modules.'" (and I verified on Mac OS X 10.6.8
that both LO's internal Pyton 2.6.1 and MacPort's python3.2 indeed import a
pyuno.so just fine).

There were additional modifications regarding pyversion stuff in the original
commit f892f979 that appear unrelated and which
I left intact.