bug#19050: Fail compile emacs with jpeg library on MinGW32

[孙林]

Dear Eli:

The lib jpeg can download from 
http://www.annexia.org/tmp/mingw/fedora-rawhide/src/SRPMS/mingw32-libjpeg-6b-8.fc11.src.rpm.
And the "--with-w32" may be for cygwin build only, that's my fail.
I think the line
> #if defined CYGWIN && defined HAVE_NTGUI
will make the libjpeg invalid when compile Emacs on MinGW32.
I had compile a Emacs with libjpeg on MinGW32, and the Emacs can show the *.jpg 
files well.
So the line should also work for MinGW32.

Best Regards
Sunline


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