mail/mailfromd: drop useless option, install Emacs Lisp files

• Obsolete features, legacy GeoIP and DSPAM, were removed on the next day after 8.14 release back in August 2022
• Install and bytecode-compile two provided Emacs Lisp files, subject to the EMACS option (off by default for now)
• While here, change the word order in BDB_DESC to clarify that the phrase "last working one" applies to version 4.8, not the Berkeley DB support in general

Requested by: maintainer