[Mageia-dev] Freeze push: gawk

[David Walser]

This contains some needed compile fixes.  It also has this:
* builtin.c (do_sub): Revert to gawk 3.1 behavior for backslash
        handling. It was stupid to think I could break compatibility.
        Thanks to John Ellson <ellson at research.att.com> for raising
        the issue.

Basically what that means is the gawk 4.0.0 we currently have is incompatible with every other version of gawk, past and future.  So we really need this update.

Confirmed it builds, installs, and works locally.