runtime: Fix compile errors in Linux backend
runtime: Fix compile errors in Linux backend

Did not get updated when IO API changed in
9c6f97ce3d0493fdd16264c4ef2414b4429772b1

rraallvv/microflo,microflo/microflo,rraallvv/microflo,microflo/microflo,microflo/microflo,microflo/microflo,microflo/microflo,microflo/microflo,rraallvv/microflo,rraallvv/microflo