'test cases/frameworks/9 wxwidgets' fails to build with clang on
Fedora because it needs C++11 enabled.
Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>
This was broken because the class property will say True but the
object property will not be set. Store the value on the class property
and transfer to object in __init__. Just like PkgConfigDependency.