Pull up following revision(s) (requested by christos in ticket #414):


external/historical/nawk/dist/main.c patch
external/historical/nawk/dist/b.c patch
external/historical/nawk/dist/lib.c patch
external/historical/nawk/dist/proto.h patch
external/historical/nawk/dist/run.c patch

Fix segfault in awk, and address PR#46155.
[christos, ticket #414]