oc-mail: Added [MAPIStoreFolder getPidTagDisplayName:inMemCtx:]

This getter is necessary to decode folder names
in utf7 encoding.

OpenChange/MAPIStoreMailFolder.m

@@ -257,6 +257,16 @@ static Class SOGoMailFolderK, MAPIStoreMailFolderK, MAPIStoreOutboxFolderK;
   return MAPISTORE_SUCCESS;
 }
 
+
+- (int) getPidTagDisplayName: (void **) data
+                    inMemCtx: (TALLOC_CTX *) memCtx
+{
+  NSString *displayName = [[sogoObject displayName] stringByDecodingImap4FolderName];
+  *data =  [displayName asUnicodeInMemCtx: memCtx];
+
+  return MAPISTORE_SUCCESS;
+}
+
 - (EOQualifier *) nonDeletedQualifier
 {
   static EOQualifier *nonDeletedQualifier = nil;