Duplicate found fix : BuiltInJavac
Duplicate found fix : BuiltInJavac

Summary: Fix for `Duplicate found when adding` related to `BuiltInJavac` class

Reviewed By: stepancheg

shipit-source-id: 8ed704b0c21f4ab4f6474ad11dcad61635f804d3

JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck,JoelMarcey/buck