MFC r292250:Allow users override `DEBUG` on the command line via DEBUG_FLAGS="-DDEBUG" withlib/libc/resolv by conditionalizing its definitionReviewed by: ume, vangyzenDifferential Revision: https://reviews.freebsd.org/D4519
MFC r269867:Update our stub resolver to final version of libbind(libbind-6.0).Obtained from: ISC