[tlbuild] build failure: libs/zziplib/zziplib-0.13.58/zzip/stat.c needs #include <strings.h> for strcasecmp

[Karl Berry]

    +#include <strings.h>

Fine for your getting things going, but certainly not something that can
be applied.  We don't want to get back into the bad old days of
including <strings.h>.

Is <strings.h> really the only place AIX has the pretty basic POSIX
function?  If so, using a replacement strcasecmp would be probably be
easier than finding it there.

Yuck.

k