Travis: remove not needed config for c++11 support.
Travis: remove not needed config for c++11 support.

FredrikHson/openddl-parser,FredrikHson/openddl-parser,kimkulling/openddl-parser,kimkulling/openddl-parser,kimkulling/openddl-parser,kimkulling/openddl-parser,FredrikHson/openddl-parser,FredrikHson/openddl-parser