x11/xorgproto: update to 2021.4

Changes: https://lists.x.org/archives/xorg-announce/2021-February/003072.html
Changes: https://lists.x.org/archives/xorg-announce/2021-February/003073.html
Changes: https://lists.x.org/archives/xorg-announce/2021-April/003085.html
PR: 255771
Reported by: portscout
Approved by: zeising
Exp-run by: antoine
Differential Revision: https://reviews.freebsd.org/D30203