[lmi] Cross compiling from cygwin to native msw

[Greg Chicares]

I've updated 'install_cygwin.bat' in svn. After running it, I did
  $cygcheck -s -v -r > cygcheck.out
and the output contains:
  mingw64-i686-binutils                   2.25.0.1.23f238d-1     OK
  mingw64-i686-gcc-core                   4.9.2-2                OK
  mingw64-i686-gcc-g++                    4.9.2-2                OK
  mingw64-i686-headers                    4.0.2-1                OK
  mingw64-i686-runtime                    4.0.2-1                OK
  mingw64-i686-windows-default-manifest   6.4-1                  OK
  mingw64-i686-winpthreads                4.0.2-1                OK
but I can't find those tools. I was expecting something like:
  /usr/bin/i686-w64-mingw32-gcc.exe
but /usr/bin/ is empty.

I don't see anything wrong in /var/log/setup.log, which indeed says:

2015/12/16 04:43:27 Extracting from 
file://C:\cache_for_lmi/http%3a%2f%2fmirrors.kernel.org%2fsourceware%2fcygwin%2f/x86/release/mingw64-i686-gcc/mingw64-i686-gcc-core/mingw64-i686-gcc-core-4.9.2-2.tar.xz

without reporting any error.

Vadim, would you mind trying this?