USES=lua gained flavors.

Ports using USES=lua:module or lua:flavors will be flavored.  A range of
supported lua versions can be set using XX-YY (or XX-, or -YY, or simply ZZ)
for ports not supporting all lua versions.

USES=lua sets LUA_FLAVOR that needs to be used on all dependencies of
flavored lua ports, in a similar way as PHP or Python flavors.

PR:		245038
Submitted by:	andrew tao11 riddles org uk
Reviewed by:	mat, kevans, russ haley gmail com
Approved by:	mat (portmgr)
Differential Revision:	https://reviews.freebsd.org/D16494

Deprecate ports broken for more than 6 months

Mark a few ports BROKEN, unfetchable

converters/lua*-iconv: enable -fPIC on arm64 and i386, for lld

Shared objects should be built as PIC, and lld enforces this by default.
Add aarch64 and i386 cases to the existing set of per-arch CFLAGS, and
remove the BROKEN_aarch64.

Approved by:	portmgr (lld blanket)
Sponsored by:	The FreeBSD Foundation

Mark these ports as broken on aarch64, and, where appropriate, armvX.

While here, pet portlint and modernize.

Approved by:	portmgr (tier-2 blanket)

Add a lua 5.1 copy of lua-iconv per user request

When we gain flavors for lua these special copies of the ports can go
away