Add pkg-config fallback to --enable-system-luajit
Add pkg-config fallback to --enable-system-luajit

Issue #1507

dyrock/trafficserver,persiaAziz/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,bryancall/trafficserver,bryancall/trafficserver,dyrock/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,duke8253/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,duke8253/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,persiaAziz/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,dyrock/trafficserver,pbchou/trafficserver,pbchou/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,davidbz/trafficserver,pbchou/trafficserver,davidbz/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver