audio/mumble needs devel/protobuf as lib depend.

[Demelier David]

Hi,
	If you install audio/mumble you will noticed that it does not depend on
	deve/protobuf because it's marked as BUILD_DEPENDS in the Makefile.
	However if you deinstall protobuf mumble will fails  It also the same
	with x11/qt4-opengl. So I would propose this patch.(see attachment).

	But there is still a missing dependency (I guess) because if you remove
	any qt4-* leaves (not depended on) mumble will segfault.

	Cheers.

-- 
Demelier David
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