Add comment in os/os-linux.h wrt glibc-2.3.2

It was a broken release wrt cpu affinity, they removed the
size argument from the set/get functions. If you want to
compile on such an ancient glibc, manually define GLIBC_2_3_2.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
1 file changed