maven: get rid of one more dependency on 'util' module (IDEA-175595)

This is needed to convert util to Java 8 (IDEA-174662).

plugins/maven/maven2-server-impl/src/org/jetbrains/maven/embedder/MavenEmbedder.java

@@ -15,7 +15,7 @@
  */
 package org.jetbrains.maven.embedder;
 
-import com.intellij.util.ExceptionUtil;
+import com.intellij.util.ExceptionUtilRt;
 import org.apache.maven.DefaultMaven;
 import org.apache.maven.Maven;
 import org.apache.maven.artifact.Artifact;
@@ -442,7 +442,7 @@ public class MavenEmbedder {
   }
 
   private MavenExecutionResult handleException(Throwable e) {
-    ExceptionUtil.rethrowUnchecked(e);
+    ExceptionUtilRt.rethrowUnchecked(e);
 
     return new MavenExecutionResult(null, Collections.singletonList((Exception)e));
   }