x11/mkcomposecache: Update to 1.2.3
Add WWW and LICENSE.
Remove unnecessary GNU_CONFIGURE_MANPREFIX.
https://lists.x.org/archives/xorg-announce/2022-April/003143.html
https://lists.x.org/archives/xorg-announce/2026-April/003686.html
PR: 288173
Approved by: x11 (arrowd)
Approved by: osa (mentor)