Get cdsrfm building in bullseye/5.0
Erik: Fix some errors raised by stricter C compiler Use ligo timespec, which auto-picks the right timespec structure for the kernel version.
EJ: Making it so find_module_symvers can find multiple symvers when they are present, cleaning up cdsrfmswitch make a bit Using the gpstime module call so we DONT do leap seconds in the cdsrfm code