Updates the compiler flags file
Updates the compiler flags file

This file gracefully deals with older compilers that do not understand
the c++03 standard (GCC 4.2 on Mac for example).

Change-Id: Ib9d694d93ab211c101eb0fcf150946964d7bacd5

OpenChemistry/openqube,OpenChemistry/openqube,OpenChemistry/openqube,OpenChemistry/openqube