mlterm: misc improvements, revbump

[barracuda156]

Description

Sort out dependencies, fix config args for fribidi variant, add support for images rendering via libsixel.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6
Xcode 3.2

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[barracuda156]

I do not know what this means and why this fails:

  --->  Patching bl_time.c: s|/usr/local|/opt/local|g
  DEBUG: Executing reinplace: /usr/bin/sed s|/usr/local|/opt/local|g </opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_x11_mlterm/mlterm/work/mlterm-3.9.3/baselib/src/bl_time.c >@file11
  sed: RE error: illegal byte sequence
  DEBUG: child process exited abnormally
      while executing
  "exec -ignorestderr -- {*}$cmdline"
  Error: reinplace: child process exited abnormally
  Error: Failed to patch mlterm: reinplace sed(1) failed
  DEBUG: Error code: NONE
  DEBUG: Backtrace: reinplace sed(1) failed

I can just drop that part, it is not strictly necessary, just was a matter of safety (to avoid pulling in wrong stuff). On buildbots that is not an issue, since /usr/local supposed to be absent.