mail/mutt: Remove feature patches
* As mentioned in efe2cf37e6 UPDATING and pkg-message to keep mail/mutt
inline with upstream removing addtional ports patches.
* Update post-install sed to be more vim make.vim syntax friendly. It is
making any # a make comments.
Some of these patches
Reported by: email@example.com (maintainer)
Differential Revision: https://reviews.freebsd.org/D40754