Don't always run code in Ant task tests

But when running code, do it via <java> task, not via custom testing code. Most
of the time the compiled code need not be runned, because it's irrelevant to
the Ant task itself

compiler/testData/integration/ant/jvm/jvmClasspath/build.log.expected

@@ -4,6 +4,7 @@ Buildfile: [TestData]/build.xml
 build:
   [kotlinc] Compiling [[TestData]/hello.kt] => [[Temp]/hello.jar]
   [kotlinc] WARNING: [TestData]/hello.kt: (15, 9) Variable 'result' is never used
+     [java] OK
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/jvm/jvmClasspath/build.xml

@@ -3,5 +3,12 @@
 
     <target name="build">
         <kotlinc src="${test.data}/hello.kt" output="${temp}/hello.jar"/>
+
+        <java classname="hello.HelloPackage" fork="true">
+            <classpath>
+                <pathelement location="${temp}/hello.jar"/>
+                <pathelement location="${kotlin.runtime.jar}"/>
+            </classpath>
+        </java>
     </target>
 </project>

compiler/testData/integration/ant/jvm/jvmClasspath/hello.kt

@@ -8,7 +8,7 @@ import sun.nio.ByteBuffered
 
 fun main(args : Array<String>) {
     val a = Big5() // charsets.jar
-    val c = DNSNameService() // dnsns.ajr
+    val c = DNSNameService() // dnsns.jar
     val e : Cipher? = null // jce.jar
     val f : SunJCE? = null // sunjce_provider.jar
     val j : ByteBuffered? = null // rt.jar

compiler/testData/integration/ant/jvm/jvmClasspath/hello.run.expected

@@ -1,4 +0,0 @@
-OUT:
-OK
-
-Return code: 0