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Before the path to the dependencies was hard coded into the generated
PocoConfig.cmake file. This causes issues with sstate.

This change overrides the libraries with just the library names and thus
let's the linker take care of finding them.
Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>