Support default module name in ant task

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

@@ -0,0 +1,11 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+  [kotlinc] Compiling [[TestData]/hello.kt] => [[Temp]/hello.jar]
+     [java] Module info 'META-INF/build.kotlin_module' exists
+
+BUILD SUCCESSFUL
+Total time: [time]
+
+Return code: 0

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

@@ -0,0 +1,14 @@
+<project name="Ant Task Test" default="build">
+    <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
+
+    <target name="build">
+        <kotlinc src="${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/moduleNameDefault/hello.kt

@@ -0,0 +1,11 @@
+package hello
+
+fun main(args : Array<String>) {
+    val systemClassLoader = ClassLoader.getSystemClassLoader()
+    val moduleName = "META-INF/build.kotlin_module"
+    val resourceAsStream = systemClassLoader.getResourceAsStream(moduleName)
+
+    if (resourceAsStream != null) {
+        println("Module info '$moduleName' exists")
+    }
+}