x11/xcb-util-cursor: Update to 0.1.6
MASTER_SITES is specified in xorg-cat.mk, so remove it.
PATCHFILES has been applied to the source files, so remove it.
Update COMMENT and WWW.
Since aclocal.m4 was generated by aclocal 1.18.1, remove USES=autoreconf
which was added in PR 287329.
https://lists.x.org/archives/xorg-announce/2025-September/003625.html
PR: 295184
Approved by: x11 (arrowd)
Approved by: osa (mentor)