merge libXtst-1.2.4 and libXxf86vm-1.1.5

revert 'const' removal changes, now that libXext is also updated.

fix some const issues.

initial import of libXtst-1.2.1

initial import of libXtst-1.2.0

initial import of libXtst-1.1.0

initial import of libXtst-1.0.3