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 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