Update kernel version to 5.17 in tst-mman-consts.py

[Andreas Schwab]

On Mär 23 2022, Joseph Myers wrote:

> This patch updates the kernel version in the test tst-mman-consts.py
> to 5.17.  (There are no new MAP_* constants covered by this test in
> 5.17 that need any other header changes.)

Ok.

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Andreas Schwab, schwab@linux-m68k.org
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