Solver::FullReport now reports build config.

The header of Summary::FullReport now looks like

Solver Summary (v 1.10.0-suitesparse-cxsparse-lapack-no_openmp)

                                     Original                  Reduced
Parameter blocks                        22122                    22122
Parameters                              66462                    66462
Residual blocks                         83718                    83718
Residual                               167436                   167436

Change-Id: Id1b81bbf90ba412d19e2dd3687eeb9d372b72c1b