kconfig: qconf: show Qt version in the About dialog

You can get the Qt version by running "pkg-config --modversion Qt5Core"
or something, but this might be useful to get the runtime Qt version
more easily. Go to the menu "Help" -> "About", then you can see it.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/qconf.cc

@@ -1799,10 +1799,13 @@ void ConfigMainWindow::showIntro(void)
 void ConfigMainWindow::showAbout(void)
 {
 	static const QString str = "qconf is Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>.\n"
-		"Copyright (C) 2015 Boris Barbulovski <bbarbulovski@gmail.com>.\n\n"
-		"Bug reports and feature request can also be entered at http://bugzilla.kernel.org/\n";
+		"Copyright (C) 2015 Boris Barbulovski <bbarbulovski@gmail.com>.\n"
+		"\n"
+		"Bug reports and feature request can also be entered at http://bugzilla.kernel.org/\n"
+		"\n"
+		"Qt Version: ";
 
-	QMessageBox::information(this, "qconf", str);
+	QMessageBox::information(this, "qconf", str + qVersion());
 }
 
 void ConfigMainWindow::saveSettings(void)