Fix warnings about missing serialVersionUID

Use @SuppressWarnings since these are private classes

Change-Id: Ic8e4c08b70627a3f9b031e2474092e1ce8116f22

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java

 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.util.FileUtils;
-
 import org.xml.sax.Attributes;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 		}
 	}
 
+	@SuppressWarnings("serial")
 	private static class ManifestErrorException extends GitAPIException {
 		ManifestErrorException(Throwable cause) {
 			super(RepoText.get().invalidManifest, cause);
 		}
 	}
 
+	@SuppressWarnings("serial")
 	private static class RemoteUnavailableException extends GitAPIException {
 		RemoteUnavailableException(String uri) {
 			super(MessageFormat.format(RepoText.get().errorRemoteUnavailable, uri));