Dependency libs: filter system paths and always add lib dir (#10622)

Fixes #10617
Fixes #10624
Closes: #10619

#8136 dependended entirely on spec.libs to retrieve library directories
from dependencies. By default this function only retrieves libraries if
their name is something like lib<package> (e.g. "libfoo.so" for a
package called "Foo"). This unconditionally adds lib/lib64 directories
for each dependency as link/rpath directories. 

This also filters system paths from link/rpaths/include directories and
removes duplicated paths that #8136 could add.

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