test: Don't add current build directory to include path

Meson adds the current source and build directory to the include path by
default. This causes a namespace clash in tests when using C++20, as the
Span class test is compiled into a binary named 'span', which then gets
included by source code through indirect '#include <span>' directives.
Unsurprisingly, the compiler doesn't react happily when fed binary data.

We could work around the problem by renaming the test executable, but
disabling the implicit inclusion of the local directory is a more
generic solution that will avoid similar issues in the future.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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