Add tests on "-language-version" usage from Ant, Maven, Gradle

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

@@ -0,0 +1,17 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+  [kotlinc] Compiling [[TestData]/main.kt] => [[Temp]/hello.jar]
+  [kotlinc] [TestData]/main.kt:3:17: error: this type is sealed, so it can be inherited by only its own nested classes or objects
+  [kotlinc] class Derived : Base()
+  [kotlinc]                 ^
+
+ERR:
+
+BUILD FAILED
+[TestData]/build.xml:5: Compile failed; see the compiler error output for details.
+
+Total time: [time]
+
+Return code: 1

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

@@ -0,0 +1,9 @@
+<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}/main.kt" output="${temp}/hello.jar">
+            <compilerarg line="-language-version 1.0"/>
+        </kotlinc>
+    </target>
+</project>

compiler/testData/integration/ant/jvm/languageVersion/main.kt

@@ -0,0 +1,3 @@
+sealed class Base
+
+class Derived : Base()