the universal crts redistributables are available as part of the Windows
10 SDK. Point to the dir (or a copy of the dir) using --with-ucrt-dir

Use --without-ucrt-dir (or --with-ucrt-dir=no) if you don't want to ship
them as part of LO and are annoyed by the configure warning.

Change-Id: I5487e3f6e583222fa053b2fc03176f061d57746c
Reviewed-on: https://gerrit.libreoffice.org/44074Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>