Fix import which produces flakey test results

Previous import gave test errors under eclipse. Probably
due to some stray directory on the classpath.

Author: odersky

compiler/test/dotty/tools/dotc/EntryPointsTest.scala

@@ -4,7 +4,7 @@ package dotc
 
 import org.junit.Test
 import org.junit.Assert._
-import dotty.tools.dotc.interfaces.{CompilerCallback, SourceFile}
+import interfaces.{CompilerCallback, SourceFile}
 import reporting._
 import reporting.diagnostic.MessageContainer
 import core.Contexts._