Revert "Remove xcb_ge_event_t from xcb.h"

Revert "Remove xcb_ge_event_t from xcb.h"

This reverts commit f4d5b84800f960831e4fbb3ad9848bbb701020be.

The version of this struct that the code generator produces breaks the API,
because it gives the fields different (albeit better) names. Thus, we need to
restore the old version of this struct.

Additionally to the revert, this struct is documented as being deprecated. The
replacement was added to xcb-proto.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71502
Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Cristau <jcristau@debian.org>