Lots of Win32 fixes for DTLS.

1. "unsigned long long" isn't portable changed: to BN_ULLONG.
2. The LL prefix isn't allowed in VC++ but it isn't needed where it is used.
2. Avoid lots of compiler warnings about signed/unsigned mismatches.
3. Include new library directory pqueue in mk1mf build system.
4. Update symbols.

ssl/s3_srvr.c

@@ -677,7 +677,7 @@ int ssl3_check_client_hello(SSL *s)
 int ssl3_get_client_hello(SSL *s)
 	{
 	int i,j,ok,al,ret= -1;
-	int cookie_len;
+	unsigned int cookie_len;
 	long n;
 	unsigned long id;
 	unsigned char *p,*d,*q;