ToolChainFactory: Add support for different languages

* Add a pure virtual method to get supportedLanguges with

Change-Id: Ida4445ca045c90fb9f7656a661af83e5b6801b30
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/ios/iosconfigurations.h

@@ -45,6 +45,7 @@ class IosToolChainFactory : public ProjectExplorer::ToolChainFactory
     Q_OBJECT
 
 public:
+    QSet<ProjectExplorer::ToolChain::Language> supportedLanguages() const override;
     QList<ProjectExplorer::ToolChain *> autoDetect(const QList<ProjectExplorer::ToolChain *> &existingToolChains) override;
 };