wined3d: Make context_attach_surface_fbo() static.

dlls/wined3d/context.c

@@ -253,7 +253,7 @@ void context_attach_depth_stencil_fbo(struct wined3d_context *context,
 }
 
 /* GL locking is done by the caller */
-void context_attach_surface_fbo(const struct wined3d_context *context,
+static void context_attach_surface_fbo(const struct wined3d_context *context,
         GLenum fbo_target, DWORD idx, IWineD3DSurfaceImpl *surface)
 {
     const struct wined3d_gl_info *gl_info = context->gl_info;

dlls/wined3d/wined3d_private.h

@@ -1200,8 +1200,6 @@ void context_apply_fbo_state_blit(struct wined3d_context *context, GLenum target
         IWineD3DSurfaceImpl *render_target, IWineD3DSurfaceImpl *depth_stencil) DECLSPEC_HIDDEN;
 void context_attach_depth_stencil_fbo(struct wined3d_context *context,
         GLenum fbo_target, IWineD3DSurfaceImpl *depth_stencil, BOOL use_render_buffer) DECLSPEC_HIDDEN;
-void context_attach_surface_fbo(const struct wined3d_context *context,
-        GLenum fbo_target, DWORD idx, IWineD3DSurfaceImpl *surface) DECLSPEC_HIDDEN;
 void context_bind_fbo(struct wined3d_context *context, GLenum target, GLuint *fbo) DECLSPEC_HIDDEN;
 struct wined3d_context *context_create(IWineD3DSwapChainImpl *swapchain, IWineD3DSurfaceImpl *target,
         const struct wined3d_format_desc *ds_format_desc) DECLSPEC_HIDDEN;