Rocq 9.1.1 is supported

Author: xavierleroy

configure

@@ -535,7 +535,7 @@ missingtools=false
 echo "Testing Coq... " | tr -d '\n'
 coq_ver=$(${COQBIN}coqc --print-version 2>/dev/null | tr -d '\r' | cut -d' ' -f1)
 case "$coq_ver" in
-  8.15.0|8.15.1|8.15.2|8.16.0|8.16.1|8.17.0|8.17.1|8.18.0|8.19.0|8.19.1|8.19.2|8.20.0|8.20.1|9.0.0|9.1.0)
+  8.15.0|8.15.1|8.15.2|8.16.0|8.16.1|8.17.0|8.17.1|8.18.0|8.19.0|8.19.1|8.19.2|8.20.0|8.20.1|9.0.0|9.1.0|9.1.1)
         echo "version $coq_ver -- good!";;
   ?*)
         echo "version $coq_ver -- UNSUPPORTED"