Several build fixes

Code/Framework/AzFramework/Platform/Mac/AzFramework/Windowing/NativeWindow_Mac.mm

@@ -34,7 +34,7 @@ namespace AzFramework
         bool GetFullScreenState() const override;
         void SetFullScreenState(bool fullScreenState) override;
         bool CanToggleFullScreenState() const override { return true; }
-        uint32_t GetMainDisplayRefreshRate() const override;
+        uint32_t GetMainDisplayRefreshRate() const;
 
     private:
         static NSWindowStyleMask ConvertToNSWindowStyleMask(const WindowStyleMasks& styleMasks);

Code/Framework/AzFramework/Platform/iOS/AzFramework/Windowing/NativeWindow_ios.mm

@@ -27,7 +27,7 @@ namespace AzFramework
                         const WindowGeometry& geometry,
                         const WindowStyleMasks& styleMasks) override;
         NativeWindowHandle GetWindowHandle() const override;
-        uint32_t GetMainDisplayRefreshRate() const override;
+        uint32_t GetMainDisplayRefreshRate() const;
         
     private:
         UIWindow* m_nativeWindow;

Code/Framework/GridMate/Platform/Android/GridMate/Session/LANSession_Android.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <unistd.h>
+#include <AzCore/std/string/string.h>
 
 namespace GridMate
 {

Code/Framework/GridMate/Platform/iOS/GridMate/Session/LANSession_iOS.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <unistd.h>
+#include <AzCore/std/string/string.h>
 
 namespace GridMate
 {