I just tried activating Linux and Windows CI for
https://code.dlang.org/packages/gmp-d
via
https://github.com/nordlow/gmp-d/.github/workflows/d.yml
Linux passes but the Windows builds all fail because `gmp.lib` is
not provisioned in the Windows CI. This is new to me so I need
some initial guidance as I'm suspecting there are multiple
package managers or direct sources download methods available for
getting gmp.lib provisioned locally so linking finds `gmp.lib`.
gmp is available via https://vcpkg.io/en/packages.html is that
the preferred way?
