MFH: r551246 r551246 r553724 r554339 r554805 r555063 r555682 r556316 r556459 r556460 r556859

x11-servers/xwayland-devel: update to 1.20.0.789

• Use -D${PORTNAME}=true to denote the only X server enabled
• Annotate do-install target is a workaround

Changes: https://gitlab.freedesktop.org/xorg/xserver/-/compare/96d19e898...446ff2d31