[swig] regenerate oboe_metal with SWIG 2.0.8
[swig] regenerate oboe_metal with SWIG 2.0.8

tlunter/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,tlunter/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,tlunter/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,tlunter/oboe-ruby