setFileTimesHiRes apparently can receive EINTR

`man utimensat` doesn't document it (at least on Ubuntu 16.04 -- but [this page](https://www.mkssoftware.com/docs/man3/futimens.3.asp) seems to do for `futimens`), but it seems that `utimensat()` can return `errno = EINTR` when interrupted.

This just occurred to me when sending SIGSTOP (Ctrl-Z) to my program and then resuming:

`setFileTimesHiRes: interrupted (Interrupted system call)`

If it can really return `EINTR`, we'd have to change

```
setFileTimesHiRes name atime mtime =
withFilePath name $ \s ->
withArray [toCTimeSpec atime, toCTimeSpec mtime] $ \times ->
throwErrnoPathIfMinus1_ "setFileTimesHiRes" name $
c_utimensat (-100) s times 0
```

to use `throwErrnoIfMinus1Retry_` instead.