Fixes#10617Fixes#10624Closes: #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.