Make sure ULAB_HAS_USER_MODULE is defined (as zero)

This fixes a problem preprocessing genhdr/moduledefs.h, which refers to it.

This file doesn't include the place that ulab normally defines
ULAB_HAS_USER_MODULE by default, so just force it.

Author: jepler

py/py.mk

@@ -55,7 +55,7 @@ endif
 ifeq ($(CIRCUITPY_ULAB),1)
 ULAB_SRCS := $(shell find $(TOP)/extmod/ulab/code -type f -name "*.c")
 SRC_MOD += $(patsubst $(TOP)/%,%,$(ULAB_SRCS))
-CFLAGS_MOD += -DCIRCUITPY_ULAB=1 -DMODULE_ULAB_ENABLED=1 -iquote $(TOP)/extmod/ulab/code
+CFLAGS_MOD += -DCIRCUITPY_ULAB=1 -DMODULE_ULAB_ENABLED=1 -DULAB_HAS_USER_MODULE=0 -iquote $(TOP)/extmod/ulab/code
 $(BUILD)/extmod/ulab/code/%.o: CFLAGS += -Wno-missing-declarations -Wno-missing-prototypes -Wno-unused-parameter -Wno-float-equal -Wno-sign-compare -Wno-cast-align -Wno-shadow -DCIRCUITPY
 endif