meson-winbuild.sh: gui parameter
Add a gui -parameter for the meson-winbuild.sh script, to build specified client instead of the default one. Presumably this can be just gtk3.22 (the default) or qt(5) at this point.
Add a gui -parameter for the meson-winbuild.sh script, to build specified client instead of the default one. Presumably this can be just gtk3.22 (the default) or qt(5) at this point.