mesa3d_cross.mk: Use android-stub for now for Backtrace.h

Signed-off-by: Bernhard Rosenkränzer <bero@baylibre.com>

android/mesa3d_cross.mk

@@ -88,6 +88,7 @@ MESON_GEN_NINJA := \
 	-Ddri-search-path=/vendor/$(MESA3D_LIB_DIR)/dri                              \
 	-Dplatforms=android                                                          \
 	-Dplatform-sdk-version=$(PLATFORM_SDK_VERSION)                               \
+	-Dandroid-stub=true                                                          \
 	-Ddri-drivers=                                                               \
 	-Dgallium-drivers=$(subst $(space),$(comma),$(BOARD_MESA3D_GALLIUM_DRIVERS)) \
 	-Dvulkan-drivers=$(subst $(space),$(comma),$(subst radeon,amd,$(BOARD_MESA3D_VULKAN_DRIVERS)))   \