Suppress all serial warnings

http://stackoverflow.com/questions/7823477/warning-serial-serializable-class-someclass-has-no-definition-of-serialversio

Fixes some of #210

F-Droid/src/org/fdroid/fdroid/compat/PRNGFixes.java

@@ -144,6 +144,7 @@ public final class PRNGFixes {
      * {@code Provider} of {@code SecureRandom} engines which pass through
      * all requests to the Linux PRNG.
      */
+    @SuppressWarnings("serial")
     private static class LinuxPRNGSecureRandomProvider extends Provider {
 
         public LinuxPRNGSecureRandomProvider() {
@@ -164,6 +165,7 @@ public final class PRNGFixes {
      * {@link SecureRandomSpi} which passes all requests to the Linux PRNG
      * ({@code /dev/urandom}).
      */
+    @SuppressWarnings("serial")
     public static class LinuxPRNGSecureRandom extends SecureRandomSpi {
 
         /*
@@ -333,4 +335,4 @@ public final class PRNGFixes {
             throw new RuntimeException("UTF-8 encoding not supported");
         }
     }
-}
+}

F-Droid/src/org/fdroid/fdroid/data/SanitizedFile.java

@@ -8,6 +8,7 @@ import java.io.File;
  * doesn't contain illegal characters.
  * Sanitized names are those which only have the following characters: [A-Za-z0-9.-_]
  */
+@SuppressWarnings("serial")
 public class SanitizedFile extends File {
 
     /**

F-Droid/src/org/fdroid/fdroid/localrepo/LocalRepoKeyStore.java

@@ -56,6 +56,7 @@ public class LocalRepoKeyStore {
         return localRepoKeyStore;
     }
 
+    @SuppressWarnings("serial")
     public static class InitException extends Exception {
         public InitException(String detailMessage) {
             super(detailMessage);

F-Droid/src/org/fdroid/fdroid/net/AsyncDownloadWrapper.java

@@ -15,6 +15,7 @@ import java.io.IOException;
  * to these events, it is important that you execute the download method of this class from the UI thread.
  * That way, all forwarded events will be handled on that thread.
  */
+@SuppressWarnings("serial")
 public class AsyncDownloadWrapper extends Handler {
 
     private static final String TAG = "fdroid.AsyncDownloadWrapper";