Unbreak build where XLib's Bool definition harms moc generated code
An other option might be to copy fix11h.h over and include that afterwards. Not sure what is better.
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <fixx11h.h> // egl.h could include XLib.h
(plasma-framework links kwindowsystem, so gets that include from its public headers)