Import of MSTPLBG/X11-XCB-0.12 from CPAN.

gitpan-cpan-distribution: X11-XCB
gitpan-cpan-version:      0.12
gitpan-cpan-path:         MSTPLBG/X11-XCB-0.12.tar.gz
gitpan-cpan-author:       MSTPLBG
gitpan-cpan-maturity:     released