man.sh: revert trapping SIGPIPE

PR:		279542
Fixes:		14a5c1068d
Reported by:	emaste
Reviewed by: imp, emaste, jilles
Pull Request: https://github.com/freebsd/freebsd-src/pull/1283

usr.bin/man/man.sh

@@ -36,9 +36,6 @@ ulimit -t 20
 # do not ignore the exit status of roff tools
 set -o pipefail
 
-# ignore SIGPIPE exits because pagers may exit before reading all their input.
-trap '' SIGPIPE
-
 # Usage: add_to_manpath path
 # Adds a variable to manpath while ensuring we don't have duplicates.
 # Returns true if we were able to add something. False otherwise.