[64bit] Xlib.h not available in cross-compile-to-self usage

[Arthur Norman <acn1 at cam dot ac dot uk>]

On a 32-bit cygwin I get
$ uname -a
CYGWIN_NT-6.1-WOW64 panamint 1.7.20(0.266/5/3) 2013-06-07 11:11 i686 Cygwin
$ find /usr -name Xlib.h -print
/usr/include/X11/Xlib.h
/usr/x86_64-pc-cygwin/sys-root/usr/include/X11/Xlib.h
/usr/lib/perl5/vendor_perl/5.14/i686-cygwin-threads-64int/Tk/pTk/Xlib.h

and using either gcc or x86_64-pc-cygwin-gcc I can build X apps, but if I 
use i686-pc-cygwin-gcc I have some of the X headers but not (eg) Xlib.h.

On 64-bit cygwin despite having installed every packaged with cygwin32 in 
its name as per the setup serach box I get
CYGWIN_NT-6.1 panamint 1.7.21(0.266/5/3) 2013-06-10 17:39 x86_64 Cygwin
$ find /usr -name Xlib.h -print
/usr/include/X11/Xlib.h
acn1@panamint usr
and so while gcc works i686-pc-cygwin-gcc will build console but not X 
apps. However it "wants" to:
$ find /usr -name X.h -print
/usr/i686-pc-cygwin/sys-root/usr/include/X11/X.h
/usr/include/X11/X.h
since a cygwin32 X.h is provided.

My presumption is that this is just a transitory feature of the 64-bit 
release (which is very welcome indeed - thanks so much) getting sorted 
out. I had been trying using an explicit "--host=.." with a view to being 
able to build both 32 and 64-bit versions of my code regardless of whether 
I was on a 32 or 64-bit shell platform.

   Arthur

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