Eliminates
mercurial/parsers.c(515) : warning C4244: 'function' : conversion from
'Py_ssize_t' to 'long', possible loss of data
mercurial/parsers.c(520) : warning C4244: 'function' : conversion from
'Py_ssize_t' to 'long', possible loss of data
mercurial/parsers.c(521) : warning C4244: 'function' : conversion from
'Py_ssize_t' to 'long', possible loss of data
when compiling for Windows x64 target using the Microsoft compiler.
PyInt_FromSsize_t does not exist for Python 2.4 and earlier, so we define a
fallback in util.h to use PyInt_FromLong when compiling for Python 2.4.
If we are in py3k, a IS_PY3K symbol is defined. Apart from that, byte strings
use the API defined in Python 2.6+ (_?PyBytes_.*). For Python < 2.6, the bytes
API is defined accordingly for mercurial usage (shameless copy from
bytesobject.h from Python's code). Some macros were backported from 2.6, as
inspired by rPath's pycompat.h.
