community/msitools: add patch for set_property

This is a feature added in master, but not part of a release yet. It's required if you want to add custom post-install actions, so bacport it.

To make the build work, we have to make sure the autoconf/automake files are up-to-date. The config.vapi file that is required is missing as well, but has been added in master, so we take that (with one missing field added).