[infer][java] revive the small example of Ant project

Summary:
Fix the build.xml so that we can have a working example of an Ant project that we can analyze with Infer

.gitignore

@@ -39,7 +39,6 @@ org.eclipse.core.resources.prefs
 .DS_Store
 
 # Directories and files generated by Infer
-infer-out/
 *.o.astlog
 *.o.sh
 infer-sources.tar.gz

infer/tests/build.xml

@@ -0,0 +1,20 @@
+<project default="compile">
+
+    <target name="clean">
+        <delete dir="ant_out"/>
+    </target>
+
+    <target name="compile">
+        <mkdir dir="ant_out"/>
+        <javac srcdir="codetoanalyze/java/infer" destdir="ant_out" includeantruntime="false">
+            <bootclasspath>
+              <pathelement location="../lib/java/android/android-19.jar"/>
+            </bootclasspath>
+            <classpath>
+              <pathelement location="../../dependencies/java/jackson/jackson-2.2.3.jar"/>
+              <pathelement location="../lib/java/models.jar"/>
+            </classpath>
+        </javac>
+    </target>
+
+</project>

infer/tests/codetoanalyze/java/infer/build.xml

@@ -1,21 +0,0 @@
-<project default="compile">
-
-    <target name="clean">
-        <delete dir="ant_out"/>
-    </target>
-
-    <target name="compile">
-        <mkdir dir="ant_out"/>
-        <javac srcdir="." destdir="ant_out" includeantruntime="false">
-            <bootclasspath>
-              <pathelement location="../../../../lib/java/android/android-19.jar"/>
-              <pathelement location="../../../../lib/java/models.jar"/>
-            </bootclasspath>
-            <classpath>
-              <pathelement location="../../../dependencies/java/jackson/jackson-2.2.3.jar"/>
-              <pathelement location="../../../../../dependencies/java/jackson/jackson-2.2.3.jar"/>
-            </classpath>
-        </javac>
-    </target>
-
-</project>