Fix a bunch of warning with clang

The option -Wno-discarded-qualifiers only exists with GCC, clang warns that
it has no effects.

Also it warns when some virtual fuction are marked with override but not
all of them.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/networksettings.h b/src/gui/networksettings.h
index c9d77e3bb..8d35b14dc 100644
--- a/src/gui/networksettings.h
+++ b/src/gui/networksettings.h
@@ -35,7 +35,7 @@ class NetworkSettings : public QWidget
 public:
     explicit NetworkSettings(QWidget *parent = 0);
     ~NetworkSettings();
-    QSize sizeHint() const;
+    QSize sizeHint() const override;
 
 private slots:
     void saveProxySettings();