Description of problem:
Environment variables from /etc/sysconfig/lirc are not passed to the daemon when starting up with systemd

Version-Release number of selected component (if applicable):
lirc-0.9.0-11.fc19.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Install lirc
2. Change environment variables in /etc/sysconfig/lirc
3. systemctl lirc start
4. ps auxwf|grep lirc|grep -v grep

Actual results:
/usr/sbin/lircd --driver=default --device=/dev/lirc0

Expected results:
same with different values

Additional info:
looks like there's nothing about /etc/sysconfig/lirc in systemd unit file:
[root@giomacdesk ~]# cat /usr/lib/systemd/system/lirc.service 
[Unit]
Description=LIRC Infrared Signal Decoder
After=network.target

[Service]
Type=forking
PIDFile=/run/lirc/lircd.pid
ExecStart=/usr/sbin/lircd --driver=default --device=/dev/lirc0 

[Install]
WantedBy=multi-user.target