In master, it is already possible to build GLib using Visual Studio
using Meson[1] for some time, so we should focus on maintaining only the
Meson build files for building GLib with Visual Studio.

[1]: There are caveats when building with Visual Studio 2008, namely
     that one needs to use the mt command to embed the manifests that
     are generated with the .exe/DLLs, for all builds, and that in the
     case where the compilation hangs on Visual Studio 2008 x64, as a
     workaround, should stop the build by terminating all cl.exe tasks
     and change the compiler optimization flag from /O2 (full speed) to
     /O1 (optimize for size), due to compiler optimization issues.