integrate vc_redist.exe into MSI

Age	Commit message (Expand)	Author
2017-04-21	gbuild: Remove MSVC 2013 legacy code	David Ostrovsky
Mike Kaganski
2017-10-31	msc-externals: don't attempt to chmod nonexisting files	Christian Lohmaier
2017-10-31	tdf#108580 ship universal crts with the program as workaround	Christian Lohmaier
2017-05-31	tdf#86776 Digitally sign soffice.bin on Windows	Andras Timar
2017-05-09	cannot sign read-only files, so u+w the redistributables	Christian Lohmaier
2017-05-09	have screenshot target depend on signing.done, not other way round	Christian Lohmaier
2016-08-18	screenshots: add new global make target	Armin Le Grand
2015-04-20	don't try to sign merged libs on windows	Christian Lohmaier