It's a generic way to configure the Visual Studio Solution
architecture. It's added to support different project
architectures, ARM specifically. It may be a good idea
to replace the Win32 and x64 with VCPROJ_ARCH=Win32
and VCPROJ_ARCH=x64 defined in corresponding qmakespecs.
Change-Id: I9b23f7393bf248a629c425187d6dd8859092c45c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>