Apply upstream Eigen commits e246f9cb and 43a01f06 - #152

Apply upstream Eigen commits e246f9cb and 43a01f06#152

eddelbuettel merged 2 commits into

RcppCore:fix/stanheadersRcppCore/RcppEigen:fix/stanheadersfrom

SteveBronder:patch/stanheadersSteveBronder/RcppEigen:patch/stanheadersCopy head branch name to clipboard