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

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Follow-up Comment #4, bug #63737 (group make):=0A=0ANot a direct answer, bu=
t have you looked at "libraries" that may satisfy that=0Arequirement?=0A=0A=
For instance, using 'bmakelib', the following snippet would fail as soon as=
=0Ayou try to run 'my-target' if 'VAR1' has is not set.=0A=0A=0A    include=
 bmakelib/bmakelib.mk=0A    =0A    my-target : bmakelib.error-if-blank( VAR=
1 )=0A    my-target :=0A=09    @echo =E2=9C=85 VAR1 value is $(VAR1)=0A=0AS=
ee https://github.com/bahmanm/bmakelib=0A=0APS: I'm the author :-)=0A=0A=0A=
=0A=0A    _______________________________________________________=0A=0ARepl=
y to this item at:=0A=0A  <https://savannah.gnu.org/bugs/?63737>=0A=0A_____=
__________________________________________=0AMessage sent via Savannah=0Aht=
tps://savannah.gnu.org/=0A
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