Adapt to rocq-prover/rocq#20855

Author: proux01

theories/_CoqProject

@@ -1,2 +1,5 @@
 -R . Stdlib
 -arg -w -arg +default
+# to handle when requiring Rocq >= 9.2
+-arg -w -arg -notation-for-abbreviation
+-arg -w -arg -ltac2-notation-for-abbreviation

theories/dune

@@ -6,7 +6,8 @@
 (env
  (dev
   (coq
-   (flags :standard -w +default))))
+   ;; see theories/_CoqProject for details
+   (flags :standard -w +default -w -notation-for-abbreviation -w -ltac2-notation-for-abbreviation))))
 
 (rule
  (targets All.v)