Use mockJDK as a bootClasspath for AbstractCompileKotlinAgainstJavaTest

Otherwise JAVA_HOME is being used that lead to test result depending
on minor JDK version used on a computer

 #KT-21047 Fixed

compiler/testData/compileKotlinAgainstJava/InnerClassFromAsteriskImport.java

@@ -4,6 +4,6 @@ import java.util.*;
 
 class InnerClassFromAsteriskImport {
 
-    public HashMap.Entry getEntry() { return null; }
+    public Map.Entry getEntry() { return null; }
 
 }