stm32/Makefile: Allow QSTR_DEFS,QSTR_GLOBAL_DEPENDENCIES to be extended.
So a board can provide custom qstr definitions if needed.
@@ -18,8 +18,8 @@ include $(BOARD_DIR)/mpconfigboard.mk
QSTR_GENERATED_HEADERS = $(BUILD)/pins_qstr.h $(BUILD)/modstm_qstr.h
# qstr definitions (must come before including py.mk)
-QSTR_DEFS = qstrdefsport.h $(QSTR_GENERATED_HEADERS)
-QSTR_GLOBAL_DEPENDENCIES = mpconfigboard_common.h $(BOARD_DIR)/mpconfigboard.h $(QSTR_GENERATED_HEADERS)
+QSTR_DEFS += qstrdefsport.h $(QSTR_GENERATED_HEADERS)
+QSTR_GLOBAL_DEPENDENCIES += mpconfigboard_common.h $(BOARD_DIR)/mpconfigboard.h $(QSTR_GENERATED_HEADERS)
# MicroPython feature configurations
MICROPY_ROM_TEXT_COMPRESSION ?= 1
