net/asterisk: Overhaul & Add *BONUS* user feature

This port now supports custom Asterisk configurations using a
*user-supplied* menuselect.makeopt file.

This feature is of most value for users that want to disable or
override default functionality that they dont want or need, particular
in space and/or resource constrained, or embedded environments.

For more information see this ports pkg-message file.

OPTIONS Changes:

• Make speex, libexecinfo and mpg123 OPTION'al
• Make menuselect backends (curses/newt) OPTION'al
• Re-order, sort and group all OPTIONS
• Rename MP3 option to MP3PLAYER (ambiguous with format_mp3 module)
• Remove override-able OPTION descriptions (dont appear necessary)
• Add CODECS, SOUNDS and DATABASE options groups for better UX
• Improve OPTION descriptions
• Temporarily disable ICONV option until libxml2 is fixed [1][2]

General Changes:

• Add support for fetching G.279 Core and MOH sounds
• Re-do patches using makepatch (portlint)
• Use %%DATADIR%% in pkg-plist (portlint)
• Make DATADIR-safe (portlint)
• Re-order Makefile sections (portlint)
• Reset @owner/@group after pkg-plist entries
• Simplify post-install: find files/dirs pkg-plist commands
• De-scope global use of LDFLAGS and CPPFLAGS
• Use OPTIONS helpers for openh323 CPPFLAGS and MAKE_ENV
• Use USE_OPENSSL and its respective variables in CONFIGURE_ARGS
• Modify build to be verbose (NOISY_BUILD)
• Pass CFLAGS/LDFLAGS to ASTCFLAGS/ASTLDFLAGS respectively in MAKE_ENV
• Update and cleanup pkg-plist
• Bump PORTREVISION

Note: These changes will be merged into net/asterisk11 and net/asterisk13

ports in the near future.

[1] https://reviews.freebsd.org/D3261
[2] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202006

Reviewed by: madpilot (maintainer)
Approved by: madpilot (maintainer)
Differential Revision: https://reviews.freebsd.org/D3262