Re-enable set but not used warnings for kernel builds.

[jhb]

Summary

make tinderbox now passes with this warning enabled as a fatal error,
so revert the change to hide it in preparation for making it fatal.

This reverts commit e8e691983bb75e80153b802f47733f1531615fa2.

sys/conf/kern.mk

 #!/bin/sh
 #
 # $FreeBSD$
 #
 
 # PROVIDE: tlsservd
 # REQUIRE: NETWORKING root mountcritlocal sysctl
 # BEFORE: nfsd
-# KEYWORD: nojail shutdown
+# KEYWORD: nojailvnet shutdown
 
 . /etc/rc.subr
 
 name="tlsservd"
 desc="NFS over TLS server side daemon"
 rcvar="tlsservd_enable"
 command="/usr/sbin/rpc.${name}"
 
 pidfile="/var/run/rpc.${name}.pid"
 required_files="/etc/rpc.tlsservd/cert.pem /etc/rpc.tlsservd/certkey.pem"
 extra_commands="reload"
 
 
 load_rc_config $name
 
 run_rc_command "$1"

sys/conf/kern.opts.mk

 #!/bin/sh
 #
 # $FreeBSD$
 #
 
 # PROVIDE: tlsservd
 # REQUIRE: NETWORKING root mountcritlocal sysctl
 # BEFORE: nfsd
-# KEYWORD: nojail shutdown
+# KEYWORD: nojailvnet shutdown
 
 . /etc/rc.subr
 
 name="tlsservd"
 desc="NFS over TLS server side daemon"
 rcvar="tlsservd_enable"
 command="/usr/sbin/rpc.${name}"
 
 pidfile="/var/run/rpc.${name}.pid"
 required_files="/etc/rpc.tlsservd/cert.pem /etc/rpc.tlsservd/certkey.pem"
 extra_commands="reload"
 
 
 load_rc_config $name
 
 run_rc_command "$1"