[patch] Fix base class lookup when base class has same name

[Nicolai Haehnle]

Hello,

given the following code:

struct A {};

namespace B {

struct A : ::A {};

}

KDevelop mistakenly believes that B::A is its own base class and thus
causes cyclic dependencies. I have attached two patches, one to add a
test to test_duchain.cpp, and another one with a proposed fix. The
test from the first patch fails with SVN trunk, but passes with the
second patch applied. The second patch fixes my problem, though given
how little I know about the duchain code, it may not be the Right Way
of fixing it.

Please review and apply if good.

cu,
Nicolai
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