pkgconfig: do not generated dependency on itself

If a project generates a single pc file but multiple shared libraries
with dependencies on each other, the generated pc name will be used to
generate a Requires.private dependency, which means the project will
depend on itself. This breaks at least some versions of pkg-config
(0.27 in RHEL7) which cannot handle the recursion and error out.

When adding the dependency using the pc name, check that it's not
on the project itself.

Fixes #4583

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