d49d81c gnulib: temporary hacks to deal with glibc libio.h removal

Authored and Committed by berrange 4 years ago
    gnulib: temporary hacks to deal with glibc libio.h removal
    
    GLibc deprecated libio.h in 2.27 and has removed it in current
    code that will become 2.28. The latter is now in Fedora rawhide
    and this change breaks gnulib which mistakenly still relies on
    these ancient symbols. Add a local hack for gnulib until a
    proper fix is available upstream.
    
    Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
    (cherry picked from commit 1b884e64112a4b7fc028d703254d3e0f35466d51)