Modify ARMA_FindARPACK.cmake to support finding libarpack64 (arpack with ILP64 support)
This removes the need to manually override the arpack finding logic in the case of arpack built with ILP64 support, which creates a libarpack64.so
library.
This removes the need to manually override the arpack finding logic in the case of arpack built with ILP64 support, which creates a libarpack64.so
library.