gnu: mingw-w64: Add -winpthreads variants.

This recursive package definition really demonstrates how magical Guix
can be :-)

Try invoking:
    ./pre-inst-env guix build mingw-w64-{x86_64,i686}{,-winpthreads}

* gnu/packages/mingw.scm (make-mingw-w64): Add XGCC, XBINUTILS optional
arguments to specify using a non-default cross-compiler/binutils.  Add
WITH-WINPTHREADS? optional argument to allow building with winpthreads
support.  Adjust accordingly for the new arguments.
(mingw-w64-i686-winpthreads, mingw-w64-x86_64-winpthreads): Add
variables.
* gnu/packages/cross-base.scm (native-libc): Add XGCC, XBINUTILS
key arugments and pass to MAKE-MINGW-W64.
(cross-libc): Pass XGCC and XBINUTILS to NATIVE-LIBC.

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