Set MKL_INTERFACE_LAYER to ILP64 if USE_BLAS64=1 (#3928, #5146)
Patch ARPACK for fortran calling convention to be consistent with MKL.
This patch was obtained from macports: http://trac.macports.org/ticket/35508
Merge branch 'vs/arpack-mkl' of github.com:JuliaLang/julia into vs/arpack-mkl
Merge branch 'vs/arpack-mkl' of github.com:JuliaLang/julia into vs/arpack-mkl
Do not apply the ARPACK patch