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Add -E flag (make warnings fatal), following the behavior of GNU m4 1.4.9+
Help and direction millert@ espie@ anton@ deraadt@

ok espie@

regress/usr.bin/m4/Makefile		diff \| blob \| history
regress/usr.bin/m4/fatalwarnings.m4	[new file with mode: 0644]	blob
regress/usr.bin/m4/fatalwarnings.out	[new file with mode: 0644]	blob
usr.bin/m4/eval.c		diff \| blob \| history
usr.bin/m4/extern.h		diff \| blob \| history
usr.bin/m4/gnum4.c		diff \| blob \| history
usr.bin/m4/m4.1		diff \| blob \| history
usr.bin/m4/main.c		diff \| blob \| history
usr.bin/m4/misc.c		diff \| blob \| history
usr.bin/m4/tokenizer.l		diff \| blob \| history

OpenBSD src

by Ahmet Artu Yildirim