We are transitioning to Meson for Visual Studio builds, but since the
Visual Studio projects are still around, we ought to keep them
up-to-date (and these projects are needed to build for Visual Studio
2008, at least for x64 builds).
Adapt to the source additions and merges for building
gio-querymodules.exe and gspawn-win[32|64]-helper-console.exe.
The initial MSVC 201x projects inadvertly disabled
RandomizedBaseAddress, which is normally enabled by default, so ensure
that is the case for all 201x builds. This feature is supported by
Visual Studio 2010 or later.
Also, for x64 builds on MSVC 2012 or later, use /HIGHENTROPYVA when
linking.
Pointed out by Ignacio Casal Quinteiro.
It was suggested that the project files be moved here as we don't actually
need to go two directory layers from $(srcroot), and would help us to
standardize on things in the future across the board.
