build.xml: Add missing depends on init for compile-main target

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1568556 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -548,7 +548,7 @@ under the License.
 
     <target name="compile-all" depends="compile,compile-ooxml-lite"/>
 
-    <target name="compile-main">
+    <target name="compile-main" depends="init">
         <javac target="${jdk.version.class}"
                source="${jdk.version.source}"
                destdir="${main.output.dir}"