OSX/CI: breeze fails on branch master

[Marko Käning]

Breeze suddenly fails to build here, as it now depends on X11, although the OSX/CI system globally sets 

	-DCMAKE_DISABLE_FIND_PACKAGE_X11=ON

It fails due to xcb:

---

/Users/marko/WC/KDECI-builds/breeze/windec/kdecoration2/config/breezedetectwidget.h:43:10: fatal error: 'xcb/xcb.h' file not found
#include <xcb/xcb.h>
         ^
1 error generated.
make[2]: *** [windec/kdecoration2/CMakeFiles/breezedecoration.dir/config/breezedetectwidget.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /Users/marko/WC/KDECI-builds/breeze/windec/kdecoration2/config/breezeexceptiondialog.cpp:28:
/Users/marko/WC/KDECI-builds/breeze/windec/kdecoration2/config/breezedetectwidget.h:43:10: fatal error: 'xcb/xcb.h' file not found
#include <xcb/xcb.h>
         ^
1 error generated.
make[2]: *** [windec/kdecoration2/CMakeFiles/breezedecoration.dir/config/breezeexceptiondialog.cpp.o] Error 1