determine windows version from major.minor only, the patch number is irrelevant.
determine windows version from major.minor only, the patch number is irrelevant.

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