Fixed sqlite build for WinRT

Change-Id: Idf5bfa8b55e8d7db46207e55de1e9176def503a6
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
qmake: added WinRT and WinPhone configuration switch

qmakespec for either WinRT or WinPhone have to specify
QMAKE_PLATFORM with winrt and/or winphone.

Change-Id: I87e0063881e6edd65de14adb006949247ce49904
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
qmake: added VCPROJ_ARCH variable.

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>
qmake: enable default reference for all winphone targets

The change adds a new ItemGroup with a single library reference:
platform.winmd.

Change-Id: I0c7f4c46654b520afb79b6c6f49b5f2d1af400d3
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Use correct toolset version for winphone builds

Change-Id: I9ecd9f632d0201e060de5cce4782912efdc6bd32
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
qmake: added CompileAsWinRT switch to the VCCLCompilerTool (the cl /ZW option)

Change-Id: I2a67779bcb38af85a2c43d3e9a15aa3ba45b4788
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
qmake: added support for WindowsMetadataFile

In order to be able to use the linker's /WINMD
and /WINMDFILE options

Change-Id: I2673e20aa073c6b807e8c9f191fd408c7976efc4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>