C++: Removes unneeded line in CcBinary

The interface output gets added to the action outputs anyway.

RELNOTES:none
PiperOrigin-RevId: 211448311
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
index 0d00e1e..e4f4b68 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcBinary.java
@@ -382,7 +382,6 @@
               ruleContext.getConfiguration(),
               LinkTargetType.INTERFACE_DYNAMIC_LIBRARY);
           linkActionBuilder.setInterfaceOutput(interfaceLibrary);
-          linkActionBuilder.addActionOutput(interfaceLibrary);
         }
       }
     }