Tests: Allow RunCMake tests to pass generator expressions
Tests: Simplify RunCMake test extra argument passing

Allow add_RunCMake_test calls to pass non-optional arguments
immediately.
Merge topic 'test-RunCMake-updates' into next

a85ee8b8 Tests: Simplify RunCMake test extra argument passing
da7155f5 Tests: Allow RunCMake tests to pass generator expressions