Bug 1054: Use set(EIGEN_CXX_FLAG_VERSION "/version") only for Intel compilers on Windows. Also removed code calling `head -n1` and always use integrated REGEX functionality.
Bug 1054: Use set(EIGEN_CXX_FLAG_VERSION "/version") only for Intel compilers on Windows.
Also removed code calling `head -n1` and always use integrated REGEX functionality.

--HG--
branch : 3.2

robustrobotics/eigen,robustrobotics/eigen,robustrobotics/eigen,robustrobotics/eigen