[Boost-build] MSVC 12.0_xp fix

Subject: [Boost-build] MSVC 12.0_xp fix
From: Vladimir Prus (vladimir.prus_at_[hidden])
Date: 2015-05-21 03:13:53

Hi,

we have an issue report that Windows Store support breaks
12.0-targeting-XP flavour of VS, here:

    https://github.com/boostorg/build/issues/64

Could somebody please test the attached patch, when building for Windows 
Store apps? I did verify that regular desktop builds with
VS 2013 still works, but I don't really know how to build Windows
Store apps.

On a related note, if anybody could provide a minimal Windows Store
app with Boost.Build, so that it can be used in future for testing,
that would be great.

Thanks in advance,
Volodya