18.104.22.168: "minor fixed for Win32" from Kalyanov Dmitry
* fix run-sbcl.sh for cygwin: need to convert the path.
* fix contrib building for cygwin with GCC 4.x installed: require GCC
3.x since GCC 4.x apparently doesn't do -mno-cygwin.
* PeekConsoleInput's third argument is the number of array in elements,
not bytes. http://msdn.microsoft.com/en-us/library/ms684344%28VS.85%29.aspx
Old usage led to stack overwriting.