Muflone [1] filed a orphan request for msbuild-15-bin [2]:
the package is out of date since long time. a more up-to-date package exists https://aur.archlinux.org/packages/msbuild-15.3-bin/ which can be merged with this one
[1] https://aur.archlinux.org/account/Muflone/ [2] https://aur.archlinux.org/pkgbase/msbuild-15-bin/