Travis config : Remove clang debug build
Travis config : Remove clang debug build

lucienfostier/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,boberfly/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,boberfly/gaffer,andrewkaufman/gaffer,boberfly/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,hradec/gaffer,johnhaddon/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,boberfly/gaffer,andrewkaufman/gaffer,hradec/gaffer