fix a typo in commit 4b483eaddf74 (regarding MKL on windows)
fix a typo in commit 4b483eaddf74 (regarding MKL on windows)

rotorliu/eigen,madlib/eigen_backup,rotorliu/eigen,madlib/eigen_backup,mjbshaw/Eigen,mjbshaw/Eigen,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,madlib/eigen_backup