Rewrite init script for procd support

Signed-off-by: Paul Wassi <p.wassi@gmx.at>

This package is currently in oldpackages. Add here to keep support for gpsd.

From oldpackages, this was bumped from 3.10 -> 3.15 and includes an upstream
patch to allow building with musl.

Signed-off-by: Pushpal Sidhu <psidhu@gateworks.com>