unix/modos: Support larger integer range in uos.stat fields.
unix/modos: Support larger integer range in uos.stat fields.

On 32-bit builds these stat fields will overflow a small-int, so use
mp_obj_new_int_from_uint to construct the int object.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

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