[Tests] Minor update for CI on Fedora
'test cases/frameworks/9 wxwidgets' fails to build with clang on
Fedora because it needs C++11 enabled.
-project('wxwidgets test', 'cpp')
+project('wxwidgets test', 'cpp', default_options : ['cpp_std=c++11'])
wxd = dependency('wxwidgets', version : '>=5', required : false)
wxd = dependency('wxwidgets', version : '>=3.0.0', required : false)
