bazel(tools/dreal.bzl): Sort/Clean up CXX flags
bazel(tools/dreal.bzl): Sort/Clean up CXX flags

soonho-tri/dreal4,dreal/dreal4,dreal/dreal4,soonho-tri/dreal4,dreal/dreal4,soonho-tri/dreal4,soonho-tri/dreal4,dreal/dreal4