Fix icc warnings: try to set TCL_UNIX_FD for #if TCL_WIN_SOCKET == TCL_UNIX_FD.  res is not used, add a XXX comment

fail everywhere.

This inappropriately disabled some capabilities which exist.

Now test for readline in -lreadline, if not found there, try it
in -ltermcap only if not in -lreadline.  If both libraries are
required, there will need to be more work, but I'm not sure
under what conditions both libraries would be required.

cases if TERM isn't set or is unknown (perhaps we should only check if
unset or empty?)

Skip the test if TERM isn't set.  This seems to occur when running under
buildbot and presumably cron.

For some more info check here:
http://mail.python.org/pipermail/python-checkins/2006-January/048704.html

Will backport if it works.

Locals `revision` and `branch` were const-incorrect.

characters.

Also, stop determining Unicode sizes with PyString_GET_SIZE.

calculate the build number.