ci (vs-build): build with NO_GETTEXT

ci (vs-build): build with NO_GETTEXT

We already build Git for Windows with `NO_GETTEXT` when compiling with
GCC. Let's do the same with Visual C, too.

Note that we do not technically _need_ to pass `NO_GETTEXT` explicitly
in that `make artifacts-tar` invocation because we do this while `MSVC`
is set (which will set `uname_S := Windows`, which in turn will set
`NO_GETTEXT = YesPlease`). But it is definitely nicer to be explicit
here.

Signed-off-by: Dennis Ameling <dennis@dennisameling.com>
Helped-by: Matthias Aßhauer <mha1993@live.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>