message: guix: Reinstate make-ssp-fixed-gcc
  Unfortunately, gcc is still not smart enough to detect whether or not
  mingw-w64 provides ssp, so let's put it back just for mingw-w64.
diff: (guix profiles)
  (guix utils))
  +(define (make-ssp-fixed-gcc xgcc)
  + "Given a XGCC package, return a modified package that uses the SSP function
  +from glibc instead of from libssp.so. Taken from:
  +http://www.linuxfromscratch.org/hlfs/view/development/chapter05/gcc-pass1.html"
  + (package
  + (inherit xgcc)
  + (arguments
  + (substitute-keyword-arguments (package-arguments xgcc)
  + ((#:make-flags flags)
  + `(cons "gcc_cv_libc_provides_ssp=yes" ,flags))))))
  +
  (define (make-gcc-rpath-link xgcc)
  "Given a XGCC package, return a modified package that replace each instance of
  -rpath in the default system spec that's inserted by Guix with -rpath-link"
  