New packages: Cygwin 32-to-64bit cross-compiler

["Yaakov (Cygwin/X)" <yselkowitz@users.sourceforge.net>]

I just uploaded a x86_64-pc-cygwin target cross-toolchain for the i686 
distro together with ~70 sysrooted libraries.  All packages are named 
with a cygwin64- prefix and are under the Devel category.

In order to use this toolchain, install at least 
cygwin64-gcc-{core,g++}, as well as the *TEST* versions of the following 
libraries: libcloog-isl4, libgmp10, libisl10, libmpc3, libmpfr4, plus 
all indicated dependencies.  Then, you can use cygport --64 to (try to) 
cross-compile your package.  Note that not all source packages can be 
cross-compiled, and some may require changes to your cygport(3), the 
build system, and/or the code in order to (cross-)compile correctly for 
x86_64-cygwin.

The following libraries are also available for the toolchain:
bzip2, catgets, cloog-isl, cloog-ppl, crypt, db, e2fsprogs 
(libcom_err/libss/etc.), expat, fontconfig, freetype2, gdbm, gettext, 
gmp, gnutls, isl, libarchive, libbfd, libblkid, libedit, libffi, 
libfontenc, libgcrypt, libgpg-error, libICE, libiconv, libmagic, libmpc, 
libSM, libssh2, libtasn1, libtool, libuuid, libX11, libXau, libXaw, 
libxcb, libXcomposite, libXdamage, libXdmcp, libXext, libXfixes, libXft, 
libXi, libxml2, libXmu, libXpm, libXrender, libxslt, libXss, libXt, 
lzo2, mpfr, ncurses, nettle, openssl, pcre, pixman, popt, ppl, python, 
readline, sqlite3, tcl, tk, xcb-util, xcb-util-image, xcb-util-wm, zlib.

If you encounter any issues with this toolchain, or need particular 
libraries to be added, please let me know here.  Also, if any "native" 
library maintainers want to take over their corresponding 
cross-libraries as well, just let me know; sources, as always, are in 
Ports git.


Yaakov