Fix overridability for double typecode

Author: tannewt

py/circuitpy_mpconfig.h

@@ -70,7 +70,6 @@ extern void common_hal_mcu_enable_interrupts(void);
 #define MICROPY_ERROR_REPORTING          (CIRCUITPY_FULL_BUILD ? MICROPY_ERROR_REPORTING_NORMAL : MICROPY_ERROR_REPORTING_TERSE)
 #define MICROPY_FLOAT_HIGH_QUALITY_HASH  (0)
 #define MICROPY_FLOAT_IMPL               (MICROPY_FLOAT_IMPL_FLOAT)
-#define MICROPY_PY_DOUBLE_TYPECODE       (CIRCUITPY_FULL_BUILD ? 1 : 0)
 #define MICROPY_GC_ALLOC_THRESHOLD       (0)
 #define MICROPY_GC_SPLIT_HEAP            (1)
 #define MICROPY_GC_SPLIT_HEAP_AUTO       (1)
@@ -262,6 +261,10 @@ typedef long mp_off_t;
 #define MICROPY_PY_COLLECTIONS_DEQUE_SUBSCR   (CIRCUITPY_FULL_BUILD)
 #endif
 
+#ifndef MICROPY_PY_DOUBLE_TYPECODE
+#define MICROPY_PY_DOUBLE_TYPECODE       (CIRCUITPY_FULL_BUILD ? 1 : 0)
+#endif
+
 #ifndef MICROPY_PY_FUNCTION_ATTRS
 #define MICROPY_PY_FUNCTION_ATTRS            (CIRCUITPY_FULL_BUILD)
 #endif