Android: remove hardcoded chmod

I don't understand why it was necessary.
on some devices, the binary is in a different location. if this is still needed for something, we need
to search for chmod binary dynamicly

android/src/com/reecedunn/espeak/FileUtils.java

@@ -71,15 +71,6 @@ public class FileUtils {
         } finally {
             outputStream.close();
         }
-        chmod(outputFile);
-    }
-
-    public static void chmod(File file) {
-        try {
-            Runtime.getRuntime().exec("/system/bin/chmod 755 " + file.getAbsolutePath());
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
     }
 
     public static void rmdir(File directory) {