Started to port to iOS; fixing compiler errors here and there

src/AppPlatform_iOS.h

@@ -52,11 +52,10 @@ public:
     
 	virtual StringVector getOptionStrings();
 
-    virtual bool isPowerVR() { return false; }
+    virtual bool isPowerVR();
     virtual bool isSuperFast();
     virtual void showKeyboard();
     virtual void hideKeyboard();
-	virtual void isPowerVR();
 private:
     
     std::string _basePath;