unix/mpconfigport_dev.h: Enable MICROPY_CAN_OVERRIDE_BUILTIN_NAMESPACES.
unix/mpconfigport_dev.h: Enable MICROPY_CAN_OVERRIDE_BUILTIN_NAMESPACES.

Change-Id: I030f6efa1438c5333885a9ff94e12f24abd34609
Signed-off-by: Paul Sokolovsky <9dc5061f178bb11813e14f1ed02ba27eaf21fa5d@users.sourceforge.net>

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython