Am 25.10.2017 um 23:14 schrieb mathog:
http://wiki.inkscape.org/wiki/index.php/Compiling_Inkscape_on_Windows
is redirected accordingly now and should be considered the "official"
guideline.

That page looks good to me.  The packaging info at the bottom is good.  With the old method the "extra" stuff was just the dlls and the MSVC c library.  What else comes along for the ride with MSYS2?

I'm not sure wether I misunderstood your question but to avoid any confusion: The "build/inkscape" directory already contains all dependencies required to run Inkscape on any Windows machine (or for git master at least any Windows machine running Windows Vista or later as GTK+3 dropped XP support).

The packaging step only wraps that directory into an installer or creates a 7-Zip archive from the contents, but you could just as well copy that directory as is or use an archiver of your own choice.

As for what ends up in the distribution folder it's basically identical to devlibs64 builds (which also used mingw-w64), i.e.

The MSVC runtime itself is *not* bundled as a compatible version should be available on all Windows machines (if that should ever *not* be the case make sure to file a bug).

Regards,
Eduard