initial import of libXext-1.3.5

initial import of libXext-1.3.2

initial import of libXext-1.3.0. important changes include:
backwards compat for older XSync clients
Initial Fence Sync Object support

initial import of libXext-1.2.0

initial import of libXext-1.1.2

initial import of libXext-1.0.4