Change the grammar to parse and extract the whole expression
that is present in the requires clause.
Make sure to preprocess the parsed content as a condition,
so that the value passed to map_condition and simplify_condition
is valid and the functions can handle more complicated conditions
like qtConfig() and if().
Wrap the final condition with an extra pair of parentheses, so that
the negated condition is computed correctly.
Handle the require clause in subdir projects, top level tests projects,
regular test projects, as well as top level repo projects.
Examples are not yet handled, because the would require some kind of
CMake public api to e.g. query if a feature is enabled.
Change-Id: I9af96cf022e47b66f24db3ca15d3803dda7a5d7c
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
d8b18385e8