Add a missing OpenMP ifdef to coordinate_descent_minimizer.cc
Add a missing OpenMP ifdef to coordinate_descent_minimizer.cc

Change-Id: I4eb74ab0cba86eee65a0ccfa2373c8e108f53758

jmwalls/ceres-solver-fork,ikoruk/ceres-solver,kartikkumar/ceres-solver,entylop/ceres-solver,stonier/ceres_solver,timfel/ceres-bin,kartikkumar/ceres-solver,kartikkumar/ceres-solver,kartikkumar/ceres-solver,ikoruk/ceres-solver,entylop/ceres-solver,DougFirErickson/ceres-solver,whuaegeanse/ceres-solver,entylop/ceres-solver,jmwalls/ceres-solver-fork,ikoruk/ceres-solver,ysonggit/ceres-solver,timfel/ceres-bin,entylop/ceres-solver,ysonggit/ceres-solver,ysonggit/ceres-solver,timfel/ceres-bin,whuaegeanse/ceres-solver,DougFirErickson/ceres-solver,jmwalls/ceres-solver-fork,whuaegeanse/ceres-solver,whuaegeanse/ceres-solver,ikoruk/ceres-solver,stonier/ceres_solver,stonier/ceres_solver,timfel/ceres-bin,stonier/ceres_solver,jmwalls/ceres-solver-fork,ikoruk/ceres-solver,DougFirErickson/ceres-solver,ysonggit/ceres-solver,DougFirErickson/ceres-solver