Qt 4.8.3 r2 in gitian and release process

Also needed to add `unzip` package for the added unzip command for
OpenSSL in the Qt build.

contrib/gitian-descriptors/qt-win32.yml

@@ -7,6 +7,7 @@ architectures:
 packages: 
 - "mingw32"
 - "zip"
+- "unzip"
 - "faketime"
 reference_datetime: "2011-01-30 00:00:00"
 remotes: []

doc/release-process.md

@@ -49,7 +49,7 @@ Release Process
 	./bin/gbuild ../bitcoin/contrib/gitian-descriptors/boost-win32.yml
 	mv build/out/boost-win32-1.50.0-gitian2.zip inputs/
 	./bin/gbuild ../bitcoin/contrib/gitian-descriptors/qt-win32.yml
-	mv build/out/qt-win32-4.8.3-gitian-r1.zip inputs/
+	mv build/out/qt-win32-4.8.3-gitian-r2.zip inputs/
 	./bin/gbuild ../bitcoin/contrib/gitian-descriptors/deps-win32.yml
 	mv build/out/bitcoin-deps-0.0.5.zip inputs/
 	./bin/gbuild ../bitcoin/contrib/gitian-descriptors/protobuf-win32.yml