webkit-efl: blacklist, webkit-efl is old and unmaintained fork with security issues

* now it also fails to build again with;
  webkit-efl/1_1.11.0-r0/ewebkit/Source/JavaScriptCore/profiler/ProfileNode.cpp:126:41: error: 'isnan' was not declared in this scope
  adding cmath include could be enough, but this was last drop
  of my patience

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>