Include <errno.h> to be safe
Include <errno.h> to be safe

My glibc pulls it in from those other headers, but I can't find
anything in the spec guaranteeing that.

vikramvgarg/grins,nicholasmalaya/grins,cahaynes/grins,cahaynes/grins,nicholasmalaya/grins,nicholasmalaya/grins,vikramvgarg/grins,cahaynes/grins,vikramvgarg/grins,nicholasmalaya/grins,cahaynes/grins,vikramvgarg/grins,vikramvgarg/grins,cahaynes/grins,cahaynes/grins,vikramvgarg/grins