add symbols needed by osmesa.
diff --git a/src/mesa/drivers/windows/gdi/mesa.def b/src/mesa/drivers/windows/gdi/mesa.def
index 3856ec1..117c65a 100644
--- a/src/mesa/drivers/windows/gdi/mesa.def
+++ b/src/mesa/drivers/windows/gdi/mesa.def
@@ -406,6 +406,9 @@
 	_mesa_initialize_context
 	_mesa_create_visual
 	_mesa_destroy_framebuffer
+	_mesa_delete_texture_object
+	_mesa_new_texture_object
+	_swrast_zbuffer_address
 	_swrast_DestroyContext
 	_ac_DestroyContext
 	_tnl_DestroyContext