use int64_t for blasint when BLAS64 defined
use int64_t for blasint when BLAS64 defined

zhmz90/scs,zhmz90/scs,robertwb/scs,ajfriend/scs,zhmz90/scs,robertwb/scs,robertwb/scs,cvxgrp/scs,robertwb/scs,ajfriend/scs,ajfriend/scs,robertwb/scs,ajfriend/scs,zhmz90/scs,ajfriend/scs,robertwb/scs,zhmz90/scs,ajfriend/scs,ajfriend/scs,zhmz90/scs,zhmz90/scs,robertwb/scs