Android: Fix starting the emulator on 32bit linux

We need to pass -force32bit on that platform.

Change-Id: Ib2e205c7147fc573ad20467429a08f47b774b94f
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>

src/plugins/android/androidconfigurations.h

@@ -215,6 +215,7 @@ public slots:
     static void clearDefaultDevices(ProjectExplorer::Project *project);
     static void updateToolChainList();
     static void updateAutomaticKitList();
+    static bool force32bitEmulator();
 
 signals:
     void updated();
@@ -228,6 +229,7 @@ private:
     AndroidConfig m_config;
 
     QMap<ProjectExplorer::Project *, QMap<QString, QString> > m_defaultDeviceForAbi;
+    bool m_force32bit;
 };
 
 } // namespace Android