ENH: Bump GCCXML to latest version.

Includes fixes for GCC 4.8.

Suggested-by: Michka Popoff <michkapopoff@gmail.com>

Change-Id: Ia28b4b0a85d4fdde34d519d2d28f5f782ca1abb9
Merge topic 'GCCXML-Bump'

2160305 ENH: Bump GCCXML to latest version.