Squid-3.2 Windows support

Hi Guido,
   For starters thanks very much for the work with kinkie setting up the
mingw test box.

In the process of fixing the trunk build I've uncovered what I think may
be the source of some IO problems. The autoconf tests do not detect
select() function as working. In the current trunk logics this means the
comm_select.cc code is used instead of comm_select_win32.cc

I'm also highly suspicious of the code inside comm_select_win32.cc. It
appears to be using different API for FD_ISSET() macros than the code in
compat/os/mswin.h

Amos

-- 
Please be using
   Current Stable Squid 2.7.STABLE9 or 3.1.9
   Beta testers wanted for 3.2.0.2