tests: ignore messages from the JVM

Reported by Giorgos Pap.
<https://lists.gnu.org/r/bug-bison/2022-08/msg00002.html>

* examples/test: Discard "Picked up _JAVA_OPTIONS:" messages.

THANKS

@@ -82,6 +82,7 @@ Gavin Smith               [email protected]
 Georg Sauthoff            [email protected]
 George Neuner             [email protected]
 Gilles Espinasse          [email protected]
+Giorgos Pap               [email protected]
 Goran Uddeborg            [email protected]
 Guido Trentalancia        [email protected]
 H. Merijn Brand           [email protected]

examples/test

@@ -137,10 +137,13 @@ run ()
     else
       cat out_eff
     fi
+    # Ignore informational messages from the JVM.
     if ! $noerr; then
-       sed -e 's/^/err: /g' \
+      sed \
-           -e 's/Reducing stack by rule .* (line .*):/Reducing stack by rule XX (line XXX):/g' \
+        -e '/^Picked up _JAVA_OPTIONS: /d' \
-           err_eff
+        -e 's/Reducing stack by rule .* (line .*):/Reducing stack by rule XX (line XXX):/g' \
+        -e 's/^/err: /g' \
+        err_eff
     fi
   } >eff