Second attempt to fix spring-boot-smoke-test-ant

Fix error introduced in commit d44e7c9af2

See gh-42333

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.gradle

@@ -54,6 +54,7 @@ task copyAntSources(type: Copy) {
 }
 
 task antRun(type: JavaExec) {
+	workingDir "${buildDir}/ant"
 	dependsOn syncTestRepository, copyAntSources, configurations.antDependencies
 	classpath = configurations.antDependencies;
 	mainClass = "org.apache.tools.ant.launch.Launcher"

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-ant/build.xml

@@ -11,7 +11,7 @@
 		actual jars). Run with '$ java -jar target/*.jar'.
 	</description>
 
-	<property name="lib.dir" location="${basedir}/build/ant/lib" />
+	<property name="lib.dir" location="${basedir}/lib" />
 	<property name="start-class" value="smoketest.ant.SampleAntApplication" />
 
 	<target name="clean-ivy-cache">