remove unused EVENTFD constant
remove unused EVENTFD constant

vmamidi/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,PSUdaemon/trafficserver,PSUdaemon/trafficserver,chenglongwei/trafficserver,SolidWallOfCode/trafficserver,reveller/trafficserver,reveller/trafficserver,rpufky/trafficserver,pbchou/trafficserver,taoyunxing/trafficserver,taoyunxing/trafficserver,SolidWallOfCode/trafficserver,taoyunxing/trafficserver,chenglongwei/trafficserver,bryancall/trafficserver,taoyunxing/trafficserver,pbchou/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,chitianhao/trafficserver,reveller/trafficserver,rahmalik/trafficserver,chitianhao/trafficserver,clearswift/trafficserver,reveller/trafficserver,pbchou/trafficserver,PSUdaemon/trafficserver,dyrock/trafficserver,PSUdaemon/trafficserver,pbchou/trafficserver,persiaAziz/trafficserver,SolidWallOfCode/trafficserver,rpufky/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,reveller/trafficserver,reveller/trafficserver,persiaAziz/trafficserver,duke8253/trafficserver,chenglongwei/trafficserver,duke8253/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,duke8253/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,PSUdaemon/trafficserver,dyrock/trafficserver,pbchou/trafficserver,pbchou/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,rahmalik/trafficserver,clearswift/trafficserver,reveller/trafficserver,rpufky/trafficserver,bryancall/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,clearswift/trafficserver,taoyunxing/trafficserver,davidbz/trafficserver,rpufky/trafficserver,dyrock/trafficserver,PSUdaemon/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,PSUdaemon/trafficserver,dyrock/trafficserver,reveller/trafficserver,chenglongwei/trafficserver,SolidWallOfCode/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,duke8253/trafficserver,dyrock/trafficserver,clearswift/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,bryancall/trafficserver,rahmalik/trafficserver,persiaAziz/trafficserver,rahmalik/trafficserver,rahmalik/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,taoyunxing/trafficserver,rahmalik/trafficserver,rpufky/trafficserver,rpufky/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,clearswift/trafficserver,rahmalik/trafficserver,chenglongwei/trafficserver,bryancall/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,reveller/trafficserver,rahmalik/trafficserver,bryancall/trafficserver,rpufky/trafficserver,SolidWallOfCode/trafficserver,clearswift/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,taoyunxing/trafficserver