libmicrohttpd: build the whole package and install pkg-config files

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: dont let cpupower-end.service fail if setting up to ondemand fails

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: update to systemd-208

Signed-off-by: Stephan Raue <stephan@openelec.tv>