remove spurious break

configure

@@ -11798,7 +11798,6 @@ $as_echo_n "checking python module 'argparse'... " >&6; }
 			if ${PYTHON:-false} -c "$testargparse"; then
 				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: found, using $PYTHON" >&5
 $as_echo "found, using $PYTHON" >&6; }
-				break
 			else
 				as_fn_error $? "not found" "$LINENO" 5
 			fi

configure.in

@@ -209,7 +209,6 @@ case "$use_python" in
 			AC_MSG_CHECKING([python module 'argparse'])
 			if ${PYTHON:-false} -c "$testargparse"; then
 				AC_MSG_RESULT([found, using $PYTHON])
-				break
 			else
 				AC_MSG_ERROR([not found])
 			fi