ncd/value_utils.h: simplify some code using cstrings
ncd/value_utils.h: simplify some code using cstrings

DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn