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/DownloadVoiceData.java

 
                     if (entry.isDirectory()) {
                         progress.file.mkdirs();
-                        FileUtils.chmod(progress.file);
                         continue;
                     }
 
                         outputStream.close();
                     }
                     zipStream.closeEntry();
-
-                    // Make sure the output file is readable.
-                    FileUtils.chmod(progress.file);
                 }
 
                 final String version = FileUtils.read(mContext.getResources().openRawResource(R.raw.espeakdata_version));

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

         } 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) {