build: Update the other win32 deps

- miniupnpc-1.8
- openssl-1.0.1e
- zlib-1.2.8
- libpng-1.6.8
- qrencode-3.4.3

contrib/gitian-descriptors/README.md

@@ -25,18 +25,8 @@ Once you've got the right hardware and software:
     mkdir gitian-builder/inputs
     cd gitian-builder/inputs
 
-    # Inputs for Linux and Win32:
-    wget -O miniupnpc-1.6.tar.gz 'http://miniupnp.tuxfamily.org/files/download.php?file=miniupnpc-1.6.tar.gz'
-    wget 'http://fukuchi.org/works/qrencode/qrencode-3.2.0.tar.bz2'
-    
-	# Inputs for Win32: (Linux has packages for these)
-    wget 'https://downloads.sourceforge.net/project/boost/boost/1.50.0/boost_1_50_0.tar.bz2'
-    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 'https://downloads.sourceforge.net/project/libpng/zlib/1.2.6/zlib-1.2.6.tar.gz'
-    wget 'https://downloads.sourceforge.net/project/libpng/libpng15/older-releases/1.5.9/libpng-1.5.9.tar.gz'
-    wget 'https://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'
+    # Get inputs (see doc/release-process.md for exact inputs needed and where to get them)
+    ...
     cd ../..
 
     cd gitian-builder
@@ -87,4 +77,4 @@ Here's a description of Gavin's setup on OSX 10.6:
 
 	export USE_LXC=1
 	git clone git://github.com/bitcoin/bitcoin.git
-	... etc
+	... etc