JS: rename "-library-files" argument to "-libraries" and change separator

Use the system separator (':' or ';') instead of commas

 #KT-16083 Fixed

compiler/testData/integration/ant/js/simpleWithStdlibAndJsFilesWithTwoModulesAsLibrary/build.xml

@@ -8,9 +8,9 @@
 
     <kotlin2js src="${library.path1}" output="${temp.library.path}/jslib-example1.js" metaInfo="true"/>
     <kotlin2js src="${library.path2}" output="${temp.library.path}/jslib-example2.js" metaInfo="true">
-      <library>
+      <libraries>
         <pathelement path="${temp.library.path}/jslib-example1.meta.js"/>
-      </library>
+      </libraries>
     </kotlin2js>
 
     <concat destfile="${temp.library.path}/jslib-example.js">
@@ -26,9 +26,9 @@
     <delete file="${temp.library.path}/jslib-example2.meta.js"/>
 
     <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
-      <library>
+      <libraries>
         <pathelement path="${temp.library.path}/jslib-example.js"/>
-      </library>
+      </libraries>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">