couple fixes to make MDR addons build with gcc 4.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20965 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/mail_daemon/inbound_protocols/imap/imap_client.cpp

@@ -45,6 +45,8 @@ struct mailbox_info {
 	BString server_mb_name;
 };
 
+class NoopWorker;
+
 class IMAP4Client : public BRemoteMailStorageProtocol {
 	public:
 		IMAP4Client(BMessage *settings, BMailChainRunner *run);

src/add-ons/mail_daemon/outbound_protocols/smtp/smtp.cpp

@@ -51,6 +51,8 @@
 #	define D(x) ;
 #endif
 
+using namespace std;
+
 /*
 ** Function: md5_hmac
 ** taken from the file rfc2104.txt