codal_port/mpconfigport.h: Enable MICROPY_PY_BUILTINS_STR_UNICODE.

This should have been enabled since the beginning, to match micro:bit v1.

Fixes issue #138.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

src/codal_port/mpconfigport.h

@@ -66,6 +66,7 @@
 #define MICROPY_ENABLE_SCHEDULER                (1)
 
 // Fine control over Python builtins, classes, modules, etc
+#define MICROPY_PY_BUILTINS_STR_UNICODE         (1)
 #define MICROPY_PY_BUILTINS_MEMORYVIEW          (1)
 #define MICROPY_PY_BUILTINS_INPUT               (1)
 #define MICROPY_PY_BUILTINS_HELP                (1)