Added {read,write}_varlong30() inline functions to use the

right long-int function based on protocol version.

io.h

@@ -25,6 +25,14 @@ read_varint30(int f)
 	return read_varint(f);
 }
 
+static inline int64
+read_varlong30(int f, uchar min_bytes)
+{
+	if (protocol_version < 30)
+		return read_longint(f);
+	return read_varlong(f, min_bytes);
+}
+
 static inline void
 write_varint30(int f, int32 x)
 {
@@ -33,3 +41,12 @@ write_varint30(int f, int32 x)
 	else
 		write_varint(f, x);
 }
+
+static inline void
+write_varlong30(int f, int64 x, uchar min_bytes)
+{
+	if (protocol_version < 30)
+		write_longint(f, x);
+	else
+		write_varlong(f, x, min_bytes);
+}