Update scripts/meson-buildoptions.sh

Update scripts/meson-buildoptions.sh

Note: `Makefile` relies on modification dates in the source tree to
detect changes to `meson_options.txt`. However, git does not track
those. Therefore, the following was necessary to regenerate
`meson-buildoptions.sh`:

    touch meson_options.txt
    cd "$BUILD_DIR"
    make update-buildoptions

Signed-off-by: Alessandro Di Federico <ale@rev.ng>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20230102104113.3438895-1-ale@rev.ng>