Adding the SIO_KEEPALIVE_VALS command to socket.ioctl on windows

Thanks egreen.

ignores the '-isysroot' option on OSX when the
corresponding SDK is not installed.

This ensures that the user can compile extensions
on OSX 10.6 using the Python.org installer and a
default installation of Xcode.

code, make this explicit in the C code to avoid confusing
error messages during the build.

to make sure it fell within [-1, 1] just in case someone implementing
strftime() in libc was stupid enough to assume this. Turns out, though, some
OSs (e.g. zOS) are stupid enough to use values outside of this range for time
structs created by the system itself. So instead of throwing a ValueError,
tm_isdst is now normalized before being passed to strftime().

Fixes issue #6823. Thanks Robert Shapiro for diagnosing the problem and
contributing an initial patch.

and other platforms, when using a non-gcc compiler. Patch by egreen.

In addition, I made explicit the signedness of all bitfields in the
IO library.

improved distutils test coverage: now the DEBUG mode is covered too (will help fix the issue #6954 in py3k branch)

* Upgrade bzip dependency to 1.0.5

version of libffi in OSX 10.6.1.

This fixes issue6918

to the libedit emulation of the readline API on OSX 10.5 or later.

This also adds a minimal testsuite for readline to check that the
history manipuation functions have the same interface with both
C libraries.

#6944: the argument to PyArg_ParseTuple should be a tuple, otherwise a SystemError is set.  Also clean up another usage of PyArg_ParseTuple.