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Suppress upstream ARPACK compiler warnings

Steffen Müthing requested to merge bugfix/suppress-arpack-compiler-warnings into master

This patch gets rid of the compiler warnings generated by the antiquated ARPACK sources by turning the ARPACK include directory into a system include directories. Compilers don't generate warnings for code in system include directories, so this is a blanket solution for all kinds of problems in this source (that we treat as upstream and thus can't fix anyway).

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