Exports all symbols for missing_mangled_definition.so test plugin (#8444)
Exports all symbols for missing_mangled_definition.so test plugin (#8444)

This fixes the tests verify_global_plugin and verify_remap_plugin when
using lld and LTO
SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,duke8253/trafficserver