sysutils/less: Update to 685

• Update MASTER_SITES
• Update WWW
• Use USES=localbase:ldflags
• Use pcre2 instead of pcre
• Remove COLORS option: it is no-op

Changes: https://github.com/gwsw/less/blob/master/NEWS
PR: 290607
Approved by: jharris@widomaker.com (maintainer)