Selectively turn some Coq 8.14 warnings off

Warning "deprecated hint rewrite without locality" cannot be addressed:
the suggested fix (qualify with Global or Local or [#export])
is not supported by Coq 8.11 to 8.13 !

Warning "deprecated instance without locality" is turned off
for generated file cparser/Parser.v only.

Menhir needs to be changed so as to generate the `Global` modifier
that would silence this warning.

Makefile

@@ -53,11 +53,21 @@ endif
 # deprecated-ident-entry:
 #    warning introduced in 8.13
 #    suggested change (use `name` instead of `ident`) supported since 8.13
+# deprecated-hint-rewrite-without-locality:
+#    warning introduced in 8.14
+#    suggested change (add Global or Local or [#export] modifier)
+#    is not supported in 8.13 nor in 8.11, but was supported in 8.9 (go figure)
+# deprecated-instance-without-locality:
+#    warning introduced in 8.14
+#    triggered by Menhir-generated files, to be solved upstream in Menhir
 
 COQCOPTS ?= \
   -w -undeclared-scope \
   -w -unused-pattern-matching-variable \
-  -w -deprecated-ident-entry
+  -w -deprecated-ident-entry \
+  -w -deprecated-hint-rewrite-without-locality
+
+cparser/Parser.vo: COQCOPTS += -w -deprecated-instance-without-locality
 
 COQC="$(COQBIN)coqc" -q $(COQINCLUDES) $(COQCOPTS)
 COQDEP="$(COQBIN)coqdep" $(COQINCLUDES)