Revert "Make fcntl to extract fd flags able to have NODELAY setting factored out."
Revert "Make fcntl to extract fd flags able to have NODELAY setting factored out."

This reverts commit 00161e9ea400584a286621a6c073abe699346ca9.

Causing IPC/PDU regression (error on read), needs a rethink.

adfernandes/pcp,prasincs/pcp,edwardt/pcp,tjanez/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,tjanez/pcp,edwardt/pcp,adfernandes/pcp,ryandoyle/pcp_original,adfernandes/pcp,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,ryandoyle/pcp_original,adfernandes/pcp,ryandoyle/pcp_original,adfernandes/pcp,aeg-aeg/pcpfans,wuliming/pcp,prasincs/pcp,tjanez/pcp,andyvand/cygpcpfans,wuliming/pcp,prasincs/pcp,prasincs/pcp,edwardt/pcp,aeg-aeg/pcpfans,edwardt/pcp,tjanez/pcp,wuliming/pcp,ryandoyle/pcp_original,adfernandes/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,edwardt/pcp,ryandoyle/pcp_original,aeg-aeg/pcpfans,tjanez/pcp,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,tjanez/pcp,andyvand/cygpcpfans,mbaldessari/pcp,edwardt/pcp,wuliming/pcp,ryandoyle/pcp_original,adfernandes/pcp,wuliming/pcp,ryandoyle/pcp_original,mbaldessari/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,andyvand/cygpcpfans,andyvand/cygpcpfans,mbaldessari/pcp,prasincs/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,mbaldessari/pcp,edwardt/pcp,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,ryandoyle/pcp_original