arpack-ng
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Fix header and pkg-config file installation
This reverts some undesirable changes introduced in the 3.9.0 release:
- Finish changing the include directory from
${includedir}/arpack-pc
back to${includedir}/arpack
(started in #398 but was missing some files). - Don't install parpack.pc and arpackSolver.pc (or their suffixed variants) unless those libraries were actually built.