mail/mew-devel: Update 6.10-49-ge50839a => 6.11, take maintainership

Changelog:
https://github.com/kazu-yamamoto/Mew/blob/v6.11/RELEASENOTE.md

• Byte compilation of elisp has been disabled. This aligns with the overhaul of the Emacs Lisp ports framework in bc45b7ec88.
• This excludes the installation of elisp files for win32.

PR: 295220
Sponsored by: UNIS Labs