meson: Switch to C++17

Due to popular request, move from C++14 to C++17. This will allow
dropping some custom constructs (such as a custom utils::clamp),
benefiting from new language features, and dropping gcc 5 and 6 from the
compilation tests.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

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