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
build: upgrade Qt used by windows build to 5.2.0
doc: bump boost version in release-process

This was forgotten in #3501.
Merge pull request #3527 from laanwj/2014_01_gitian_win32_qt5

build: update win32 deps