Msys2 Makefile.meson: Set min-win-ver
Set min-win-ver in meson-winbuild.sh, instead of relying on meson.build defaults. Depends on #46347
Especially; set it to win10 for *all* "win64-10" builds.
Set min-win-ver in meson-winbuild.sh, instead of relying on meson.build defaults. Depends on #46347
Especially; set it to win10 for *all* "win64-10" builds.