Rebuild against glibc without nsl library
    
    Perl opportunistically links against nsl library because some
    platforms provide gethostbyname() in it. This is not the case of GNU
    libc. Yet the "-lnsl" gets into $Config{perllibs} and
    ExtUtils::Embed enforces it. This breaks with glibc-2.26.9000-40 that
    removed the library.
    
    Simple rebuild against the new glibc fixes it.