Fix a few "bad example" problems in the rc.d scripts that have been

propogated by copy and paste.

1. Primarily the "empty variable" default assignment, which is mostly
${name}_flags="", but fix a few others as well.
2. Where they are not already documented, add the existence of the _flags
(or other deleted empties) option to the comments, and in some cases add
comments from scratch.
3. Replace things that look like:
prefix=%%PREFIX%%
command=${prefix}/sbin/foo
to just use %%PREFIX%%. In many cases the $prefix variable is only used
once, and in some cases it is not used at all.
4. In a few cases remove ${name}_flags from command_args
5. Remove a long-stale comment about putting the port's rc.d script in
/etc/rc.d (which is no longer necessary).

No PORTREVISION bumps because all of these changes are noops.

comms/lirc/files/lircd.sh.in

@@ -19,13 +19,11 @@ load_rc_config ${name}
 : ${lircd_enable="NO"}
 : ${lircd_device="/dev/lirc0"}
 
-
-prefix=%%PREFIX%%
-procname=${prefix}/sbin/lircd
+procname=%%PREFIX%%/sbin/lircd
 pidfile=/var/run/lircd.pid
-lircd_config="${prefix}/etc/lircd.conf"
+lircd_config="%%PREFIX%%/etc/lircd.conf"
 required_files=${lircd_config}
-command="${prefix}/sbin/lircd"
+command="%%PREFIX%%/sbin/lircd"
 command_args="-d ${lircd_device} ${lircd_config}"
 
 run_rc_command "$1"