configure is broken

[pgj]

Commit b06446edd4753f964a46d27ddae864fad97adc13 has changed the semantics of configure that it now fails to properly detect if fdatasync(2) is available on the given platform. For more details, please see ticket #11137 of GHC.

[pgj]

I can confirm that commit 5d5b74716b696b0f22c37a88ccc5c114b13f0398 works for me.