Add MADV_DONTNEED_LOCKED from Linux 5.18 to bits/mman-linux.h

[Andreas Schwab]

On Mai 31 2022, Joseph Myers wrote:

> Linux 5.18 adds a constant MADV_DONTNEED_LOCKED (defined in multiple
> header files, but with the same value on all architectures).  Add this
> constant to bits/mman-linux.h.

Ok.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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