Remove libtool (introduced with spglib 1.9.9)
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Do not use libtool in Octopus nor spglib. This causes a lot of issues with compilation.
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spglib should be a non-installed library.
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Do not link -lm explicitly.
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Older versions of autotools cannot run a command to parse the version number, so give it explicitly.
This enables Octopus to be compiled on Blue Gene/Qs.