Get rid of this noise (obsolete Linux Software Map data file)

I sent an update ("add" email), but it was rejected with
"No LSM entries were found" - whatever that means.

install/lsm.txt

-Linux Software Map (LSM) Entry
-==============================
-
-After updating, send it to 'lsm@qqx.org' with the subject 'add'.
-
-Begin4
-Title: Synchronet BBS Software
-Version: 3.20d
-Entered-date: 2025-03-03
-Description: BBS Software for the Internet Age
-Keywords: BBS Fido FidoNet QWK Zmodem Telnet Rlogin SSH Gopher Finger News ANSI CP437 UTF-8 PETSCII
-Author: rob@synchro.net (Rob Swindell)
-Maintained-by: rob@synchro.net (Rob Swindell)
-Primary-site:  www.synchro.net
-Alternate-site: wiki.synchro.net
-Original-site:
-Copying-policy: GPLv2
-End