[bug #63737] Add --fail-on-undefined-variables

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Follow-up Comment #3, bug #63737 (group make):=0A=0AThis is the difference,=
 when spotting a fire, between=0A"call your grandma and ask her to call the=
 fire department" vs.=0A"call the fire department".=0A=0AOr "warn that you =
have now crashed through six restaurant windows"=0Avs. "Sorry Bill, if I al=
lowed you to proceed, you would have crashed=0Aroyally."=0A=0A=0A=0A=0A    =
_______________________________________________________=0A=0AReply to this =
item at:=0A=0A  <https://savannah.gnu.org/bugs/?63737>=0A=0A_______________=
________________________________=0AMessage sent via Savannah=0Ahttps://sava=
nnah.gnu.org/=0A
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