Xext: fix missing include of <X11/Xmd.h>
Including <X11/extensions/securproto.h> depends on <X11/Xmd.h> has been included before.
Also enabling xcsecurity in CI build.
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Including <X11/extensions/securproto.h> depends on <X11/Xmd.h> has been included before.
Also enabling xcsecurity in CI build.