x11/cinnamon: unbreak build by declare a missed dependency (+)

Fixes this error:
/usr/local/include/muffin/cogl/cogl/cogl-egl-defines.h:38:10: fatal error: 'EGL/eglmesaext.h' file not found

38 | #include <EGL/eglmesaext.h>
   |          ^~~~~~~~~~~~~~~~~~

1 error generated.

Reported by: pkg-fallout