overlapped ReadFile should ignore EAGAIN

[Mike McCormack]

This is a fix for the problem below. Since all COM port fds are
non-blocking, if we get an error (EAGAIN) return from the initial
read, we should just ignore it and let the wineserver poll on it.

Mike

0806e1d8:Call
kernel32.ReadFile(000000a4,40c02a40,00000400,40596944,40bf3f44)
ret=0043ecff
trace:file:ReadFile 164 0x40c02a40 1024 0x40596944 0x40bf3f44
trace:file:FILE_SetDosError errno = 11 Resource temporarily
unavailable                                       


ChangeLog:
* ignore errors on initial read for overlapped ReadFile



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