Fix FreeBSD 12 link issue in test_libhttp2. (#7367)
Fix FreeBSD 12 link issue in test_libhttp2. (#7367)

Co-authored-by: Damian Meden <ccf7897376f9ca1a0586d4bf0aca6759498efc40@verizonmedia.com>
duke8253/trafficserver,pbchou/trafficserver,pbchou/trafficserver,pbchou/trafficserver,duke8253/trafficserver,bryancall/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,bryancall/trafficserver,duke8253/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver