d3d11_fmt: make D3D11_CreateDeviceExternal private

modules/video_chroma/d3d11_fmt.c

@@ -319,8 +319,7 @@ void D3D11_ReleaseDevice(d3d11_decoder_device_t *dev_sys)
     D3D11_Destroy( &sys->hd3d );
 }
 
-#undef D3D11_CreateDeviceExternal
-HRESULT D3D11_CreateDeviceExternal(vlc_object_t *obj, ID3D11DeviceContext *d3d11ctx,
+static HRESULT D3D11_CreateDeviceExternal(vlc_object_t *obj, ID3D11DeviceContext *d3d11ctx,
                                    bool hw_decoding, d3d11_device_t *out)
 {
     HRESULT hr;

modules/video_chroma/d3d11_fmt.h

@@ -139,10 +139,6 @@ int D3D11_AllocateResourceView(vlc_object_t *obj, ID3D11Device *d3ddevice,
 d3d11_decoder_device_t *D3D11_CreateDevice(vlc_object_t *obj, IDXGIAdapter *,
                                    bool hw_decoding, bool forced);
 #define D3D11_CreateDevice(a,b,c,d)  D3D11_CreateDevice( VLC_OBJECT(a), b, c, d )
-HRESULT D3D11_CreateDeviceExternal(vlc_object_t *obj, ID3D11DeviceContext *,
-                                   bool hw_decoding, d3d11_device_t *out);
-#define D3D11_CreateDeviceExternal(a,b,c,d) \
-    D3D11_CreateDeviceExternal( VLC_OBJECT(a), b, c, d )
 
 void D3D11_ReleaseDevice(d3d11_decoder_device_t *);