Merge pull request #2439 from hierophect/stm32-cpython-compat

STM32: Cpython compatibility flag

Author: dhalbert

ports/stm32f4/mpconfigport.mk

@@ -65,9 +65,13 @@ ifndef CIRCUITPY_NEOPIXEL_WRITE
 CIRCUITPY_NEOPIXEL_WRITE = 1
 endif
 
-ifndef
+ifndef CIRCUITPY_DISPLAYIO
 CIRCUITPY_DISPLAYIO = 1
 endif
 
+ifndef MICROPY_CPYTHON_COMPAT
+MICROPY_CPYTHON_COMPAT = 1
+endif
+
 #ifeq ($(MCU_SUB_VARIANT), stm32f412zx)
 #endif