Revert previous commit: one cannot setup the trap before acquiring the

lockfile, because we do not want the trap to be launched if the acquirement
makes the script exit!

Scripts/developer_scripts/autotest_cgal_with_cmake

@@ -858,9 +858,6 @@ else
   MAKE_CMD='make'
 fi
 
-# that line makes the script remove the lock file in case of unwanted exit
-trap "rm -f $LOCK_FILE" EXIT HUP INT TERM
-
 # Acquire lock
 lockfile -r 5 "$LOCK_FILE";
 if [ ${?} != 0 ]; then
@@ -868,6 +865,9 @@ if [ ${?} != 0 ]; then
   exit 1;
 fi
 
+# that line makes the script remove the lock file in case of unwanted exit
+trap "rm -f $LOCK_FILE" EXIT HUP INT TERM
+
 # Notify test started
 if [ ! "${MAIL_ADDRESS}" = "must_be_set_in_.autocgalrc" ]; then
   for i in ${MAIL_ADDRESS}; do