[JS KLIB IC] Fix test runner

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalJsKlibCompilerRunnerTest.kt

@@ -12,12 +12,10 @@ abstract class AbstractIncrementalJsKlibCompilerRunnerTest : AbstractIncremental
             sourceMap = true
             irBackend = true
             irProduceOnly = "klib"
+            // Don't zip klib content since date on files affect the md5 checksum we compute to check whether output files identical
+            irLegacyGradlePluginCompatibility = true
         }
 
-    override fun rebuildAndCompareOutput(sourceRoots: List<File>, testDir: File, buildLogSteps: List<BuildStep>, outDir: File) {
-        // todo fix
-    }
-
     override val buildLogFinder: BuildLogFinder
         get() = super.buildLogFinder.copy(isJsIrEnabled = true)
 }