bug fix on windows

optim_to_opale/myantce.ant

@@ -95,6 +95,7 @@
             <param name="msg" value="Running optim_to_hdoc bat script"/>
         </antcall>
         <exec executable="cmd" dir="${optim_to_hdoc}">
+            <arg value="/c"/>
             <arg value="${optim_to_hdoc}/run.bat"/>
         </exec>
     </target>
@@ -142,6 +143,7 @@
         </antcall>
         
         <exec executable="cmd" dir="${hdoc_to_opale}">
+            <arg value="/c"/>
             <arg value="${hdoc_to_opale}/run.bat"/>
         </exec>
     </target>