qmlplugindump: Mark qsigSegvHandler with Q_NORETURN

Change-Id: I4b25bbe4f777f524762e6f3f15df9fc358a46da6
Reviewed-by: Marco Benelli <marco.benelli@qt.io>

tools/qmlplugindump/main.cpp

@@ -732,7 +732,7 @@ enum ExitCode {
 };
 
 #ifdef Q_OS_UNIX
-void sigSegvHandler(int) {
+Q_NORETURN void sigSegvHandler(int) {
     fprintf(stderr, "Error: SEGV\n");
     if (!currentProperty.isEmpty())
         fprintf(stderr, "While processing the property '%s', which probably has uninitialized data.\n", currentProperty.toLatin1().constData());