Add SYNC_FILE_RANGE_WRITE_AND_WAIT from Linux 5.2 to bits/fcntl-linux.h

[Florian Weimer]

* Joseph Myers:

> +/* SYNC_FILE_RANGE_WRITE_AND_WAIT ensures all pages in the range are
> +   written to disk before returning.  */
> +# define SYNC_FILE_RANGE_WRITE_AND_WAIT	(SYNC_FILE_RANGE_WRITE		\
> +					 | SYNC_FILE_RANGE_WAIT_BEFORE	\
> +					 | SYNC_FILE_RANGE_WAIT_AFTER)

This matches the kernel definition.  Please commit.

Thanks,
Florian