Ant task: support 'failOnError' attribute in kotlinc and withKotlin

compiler/testData/integration/ant/jvm/doNotFailOnError/IncorrectJavaCode.java

@@ -0,0 +1,3 @@
+package hello;
+
+public class IncorrectJavaCode {

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

@@ -0,0 +1,21 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+    [javac] Compiling 2 source files to [Temp]
+    [javac] Compiling [[TestData]] => [[Temp]]
+    [javac] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Parameter name expected
+    [javac] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Expecting comma or ')'
+    [javac] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Expecting ')'
+  [kotlinc] Compiling [[TestData]] => [[Temp]]
+  [kotlinc] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Parameter name expected
+  [kotlinc] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Expecting comma or ')'
+  [kotlinc] ERROR: [TestData]/incorrectKotlinCode.kt: (4, 1) Expecting ')'
+
+BUILD SUCCESSFUL
+Total time: [time]
+
+ERR:
+    [javac] Compile failed; see the compiler error output for details.
+
+Return code: 0

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

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+<project name="Ant Task Test" default="build">
+    <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
+
+    <target name="build">
+        <javac srcdir="${test.data}" destdir="${temp}" includeantruntime="false" failonerror="false">
+            <withKotlin/>
+        </javac>
+
+        <kotlinc src="${test.data}" output="${temp}" failonerror="false"/>
+    </target>
+</project>

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

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+
+ERR:
+Exception in thread "main" java.lang.NoClassDefFoundError: hello/HelloPackage
+Caused by: java.lang.ClassNotFoundException: hello.HelloPackage
+	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
+	at java.security.AccessController.doPrivileged(Native Method)
+	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
+	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
+	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
+	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
+
+Return code: 1

compiler/testData/integration/ant/jvm/doNotFailOnError/incorrectKotlinCode.kt

@@ -0,0 +1,3 @@
+package hello
+
+fun main(