gio/giomm/meson.build: Use giomm-int rule for all builds
gio/giomm/meson.build: Use giomm-int rule for all builds

Like the previous commit, let builds from release tarballs and GIT
checkouts build the giomm-int static library, and link the final
.so/.dll from the objects that form giomm-int static .lib.  By doing so
we can build giomm with the import libraries for Visual Studio builds
with gendef, as well as linking in the version resource for all Windows
builds.

GNOME/glibmm,GNOME/glibmm,GNOME/glibmm,GNOME/glibmm,GNOME/glibmm