Correctly expose that ResourceState is a friend class.
ResourceState is a class that lives in kdepim-runtime and is outside the Akonadi namespace. clang < 3.3 and all versions of GCC erroneously consider the friend declaration in namespace N { class C { friend class A; }; } class A { }; to refer to the class A outside namespace N (technically speaking, this is item 3 of section 7.3.1.2 of the C++ standard). clang 3.3 fixes this behavior and makes the build of kdepim-runtime fail. Fix it by explicitly referring to ::ResourceState in the friend declaration. Alternatively, we could remove the friend declaration and make ResourceState::collectionsRetrieved use ImapResource::Append instead of Akonadi::ResourceBase::Append (since ImapResource also declares ResourceState as a friend). REVIEW: 110777
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