merge libXt 1.3.1.

merge libXfixes 6.0.1, libXft 2.3.8, libXi 1.8.1, libXpm 3.5.16,
libXt 1.3.0, and xtrans 1.5.0.

merge libXaw 1.0.14, libXres 1.2.1, and libXt 1.2.1.

merge libXt 1.2.0

merge libXt 1.1.4 and libXtst 1.2.2.

initial import of libXt-1.1.1. important changes include:
avoid some NULL derefs
snprintf cleanup
big-endian 64 bit fixes

initial import of libXt-1.0.9