Note: the script is imported as-is, but .bb file is modified because we use .service file from previous patch instead of init file. I'm not familiar enough with bitbake to be sure that the changes are correct so I'd appreciate thorough review.
Inherit the pkgconfig bbclass so libbsd can be found properly and pass in LDFLAGS to make sure the right link line is being used.
Fixes: SYS#1962 [hfreyther: Add mising task-sysmocom-feed entry]