misc/mc: the port had been improved (+)

• By popular demand, disable EXTATTR option by default: the benefits it provides are outweighed by having to pull `sysutils/e2fsprogs' port as dependency and various troubles people are having with it. While here, adjust the description as it was is a bit misleading: it is not limited exclusively to ext2fs, but can also manage UFS- specific flags like append-only, etc. [1]

• Fix ZIP/UNZIP program detection and add missing dependency on the archivers/zip' as FreeBSD does not provide native zip(1) program. This bug had been present since late 2014: when fixing PR 193766, an incomplete patch had been committed; it went unnoticed because apparently users rarely create ZIP archives, and extraction worked because archivers/unzip' is very commonly installed package [2]

PR: 249284, 256766 [1]
256546, 193766 [2]