xlocale.h and glibc 2.26

[Nigel Horne]

    Debian bug 883392 
    (https://www.mail-archive.com/debian-glibc@lists.debian.org/msg56504.html) 
    has been affecting a number of my smokers.  Has it affected anyone 
    else?  My workaround (horrible that it is) has been to create an empty 
    /usr/local/xlocale.h.
    
    -Nigel