unix/modselect: Remove unix-specific implementation of select module.

The unix port has a custom select module which only works with objects that
have a file descriptor, eg files and sockets.  On the other hand, bare
metal ports use the common extmod/modselect.c implementation of the select
module that supports polling of arbitrary objects, as long as those objects
provide a MP_STREAM_POLL in their ioctl implementation (which can be done
in C or Python).

This commit removes the unix-specific code and makes unix use the common
one provided by extmod/modselect.c instead.  All objects with file
descriptors implement MP_STREAM_POLL so they continue to work.

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

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