Add GenericEvent extension to Xext.
This adds (unconditional) support for the GE extension. Anything from now on that sends events in MPX will have to use the GE extension. No GE, no MPX events. GE is not actually used yet from anywhere with this commit. You will need to update x11proto, xextproto, libX11, libXext and xcb to the matching xge branches. Things will _NOT_ work without the updated protocol headers and libraries.
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