Fix and improve release-process.md

This commit adds a step, which is to git checkout the version to be
built. This ensures that the gitian-descriptors for said version will be
the correct ones. In addition, it updates the links for several
dependencies, where the previously existing links were dead.

doc/release-process.md

@@ -31,6 +31,9 @@ Release Process
   
 	export SIGNER=(your gitian key, ie bluematt, sipa, etc)
 	export VERSION=(new version, e.g. 0.8.0)
+	pushd ./bitcoin
+	git checkout v${VERSION}
+	popd
 	pushd ./gitian-builder
 
  Fetch and build inputs: (first time, or when dependency versions change)
@@ -39,13 +42,13 @@ Release Process
 	wget 'http://miniupnp.free.fr/files/download.php?file=miniupnpc-1.6.tar.gz' -O miniupnpc-1.6.tar.gz
 	wget 'http://www.openssl.org/source/openssl-1.0.1c.tar.gz'
 	wget 'http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz'
-	wget 'http://zlib.net/zlib-1.2.6.tar.gz'
+	wget 'ftp://ftp.simplesystems.org/pub/libpng/png/src/history/zlib/zlib-1.2.6.tar.gz'
-	wget 'ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng-1.5.9.tar.gz'
+	wget 'ftp://ftp.simplesystems.org/pub/libpng/png/src/history/libpng15/libpng-1.5.9.tar.gz'
 	wget 'http://fukuchi.org/works/qrencode/qrencode-3.2.0.tar.bz2'
 	wget 'http://downloads.sourceforge.net/project/boost/boost/1.54.0/boost_1_54_0.tar.bz2'
 	wget 'https://svn.boost.org/trac/boost/raw-attachment/ticket/7262/boost-mingw.patch' -O \ 
 	     boost-mingw-gas-cross-compile-2013-03-03.patch
-	wget 'http://releases.qt-project.org/qt4/source/qt-everywhere-opensource-src-4.8.3.tar.gz'
+	wget 'http://download.qt-project.org/archive/qt/4.8/4.8.3/qt-everywhere-opensource-src-4.8.3.tar.gz'
 	wget 'http://protobuf.googlecode.com/files/protobuf-2.5.0.tar.bz2'
 	cd ..
 	./bin/gbuild ../bitcoin/contrib/gitian-descriptors/boost-win32.yml