Message 217380 - Python tracker

Hmm, obmalloc.c changed as well, so already the gcc optimizer can take
different paths and produce different results.

Also I did set mpd_callocfunc to PyMem_Calloc(). 2% slowdown is far
from being a tragic result, so I guess we can ignore that.

The bytes() speedup is very nice. Allocations that took one second
are practically instant now.