Where has fdatasync gone?

[Alejandro Lopez-Valencia]

In the 1.5.7 runtime, the prototype for fdatasync exists in
/usr/include/sys/unistd.h, but it is nowhere to be found in the actual
import library.

Is this a newlib or a cygwin bug?

Reproducint the bug:

$ grep fdatasync /usr/include/sys/unistd.h

$ nm /usr/lib/libc.a | grep 'T __fdatasync'



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