Update contrib/debian and remove system json_spirit patch.

That patch has been broken for a long, long time (forever?) and
doesn't make sense.

contrib/debian/changelog

@@ -1,3 +1,9 @@
+bitcoin (0.6.3-natty1) natty; urgency=low
+
+  * New upstream release.
+
+ -- Matt Corallo <matt@bluematt.me>  Mon, 25 Jun 2012 23:47:00 +0200
+
 bitcoin (0.6.2-natty1) natty; urgency=low
 
   * Update package description and launch scripts.

contrib/debian/patches/1001_use_system_json-spirit.patch

@@ -1,26 +0,0 @@
-Description: Use system JSON Spirit library
-Author: Jonas Smedegaard <dr@jones.dk>
-Last-Update: 2011-05-17
---- a/src/rpc.cpp
-+++ b/src/rpc.cpp
-@@ -12,9 +12,7 @@
- #include <boost/asio/ssl.hpp> 
- typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> SSLStream;
- #endif
--#include "json/json_spirit_reader_template.h"
--#include "json/json_spirit_writer_template.h"
--#include "json/json_spirit_utils.h"
-+#include <json_spirit.h>
- #define printf OutputDebugStringF
- // MinGW 3.4.5 gets "fatal error: had to relocate PCH" if the json headers are
- // precompiled in headers.h.  The problem might be when the pch file goes over
---- a/src/makefile.unix
-+++ b/src/makefile.unix
-@@ -23,6 +23,7 @@
-    -l boost_thread \
-    -l db_cxx \
-    -l ssl \
-+   -l json_spirit \
-    -l crypto
- 
- ifdef USE_UPNP

contrib/debian/patches/series

@@ -1 +1 @@
-#1001_use_system_json-spirit.patch
+