D3D: Make the swapchain available outside of the namespace.

This commit reverts a part of pull request #579.

Source/Core/VideoBackends/D3D/D3DBase.cpp

@@ -31,7 +31,7 @@ namespace D3D
 
 ID3D11Device* device = nullptr;
 ID3D11DeviceContext* context = nullptr;
-static IDXGISwapChain* swapchain = nullptr;
+IDXGISwapChain* swapchain = nullptr;
 D3D_FEATURE_LEVEL featlevel;
 D3DTexture2D* backbuf = nullptr;
 HWND hWnd;

Source/Core/VideoBackends/D3D/D3DBase.h

@@ -40,6 +40,7 @@ void Close();
 
 extern ID3D11Device* device;
 extern ID3D11DeviceContext* context;
+extern IDXGISwapChain* swapchain;
 extern HWND hWnd;
 extern bool bFrameInProgress;