- more clean up of the generated import library definiton (.DEF file)
following checking of patch 770521, and tightening of the sed regexps.
- use -O3 even with gcc 2.8.1 - worth nearly 10% with 2.3; worth
nothing with 2.2.x.
- clean up a couple of whitespace issues introduced by a cut'n'paste.
- separate the building of the core from the wrapper executables and the
external modules (.PYDs), based on the Py_BUILD_CORE define;
- clean up the generated import library definiton (.DEF file) to remove
references to a number of non-static symbols that aren't part of the
Python API and which shouldn't be exported by the core DLL;
- compile the release build with -fomit-frame-pointer, for a small
performance gain;
- make "make clean" remove byte compiled Python library files.