Log Message:
xcursor-themes: Pass --with-cursordir to always install under ${PREFIX}

Without passing `--with-cursordir' - e.g. with native X11 on NetBSD
- /usr/X11R7 is picked up instead leading to PLIST mismatches
because no files ends up installed under (${DESTDIR}/)${PREFIX}.

Problem reported by matt farnsworth via PR pkg/54175, thanks!