GccToolChain: Remove useless member of config widget

Change-Id: Ie62f5aa5fc400cec47eba29ee59449c8a8b3ba53
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/gcctoolchainfactories.h

@@ -100,7 +100,6 @@ private:
     QLineEdit *m_platformLinkerFlagsLineEdit;
     AbiWidget *m_abiWidget;
 
-    QList<Abi> m_abiList;
     bool m_isReadOnly;
     QByteArray m_macros;
 };