LDFLAGS to the linker command when linking a python extension. This lets
us pass the right flags to correctly find libraries required for certain
extensions, e.g. zlib.so.
Also explicitly comment out a few extensions that aren't being built and
should never be.
pure bugfix release
-install the "pydoc" script as "pydoc2.1" and make sure the corresponding
python version is used
-disable the audioop, imageop and rgbimg extensions - these don't work on
64-bit platforms anyway, I haven't seen a place where they are used yet,
and in case a need shows up, we better make an own extension pkg from
it which is marked FOR_PLATFORM_ONLY
