Do not put "Class-Path: kotlin-stdlib.jar" into kotlin-reflect manifest

Since the kotlin-reflect artifact might be used in environments where
the kotlin-stdlib artifact is named something else (e.g.
kotlin-stdlib-{version}.jar) and the file existence is verified by the
launcher

 #KT-16399 Fixed

libraries/tools/kotlin-reflect/build.gradle

@@ -85,7 +85,6 @@ task reflectShadowJar(type: ShadowJar) {
     classifier = 'shadow'
     version = null
     manifestAttributes(manifest, project, 'Main')
-    manifest.attributes 'Class-Path': 'kotlin-stdlib.jar'
 
     from (sourceSets.main.output)
     from ("${core}/descriptor.loader.java/src") {