Cosmetic changes to os_io.c
Force commit of lib/_io.c (which is normally commited at new releases) because it must be consistent with lib/os_io.c (which is committed on every commit). The file lib/_io.c contains offsets into the port structure which must be consistent with those defined in lib/os_io.c .

For the record, these commands were used for this special commit instead of a "make commit":

git update-index --no-assume-unchanged lib/_io.c
make stamp
git commit -a
git update-index --assume-unchanged lib/_io.c