meson: re-generate scripts/meson-buildoptions.sh to fix IGVM entry

meson: re-generate scripts/meson-buildoptions.sh to fix IGVM entry

Commit 84fe49d94a ("meson: Add optional dependency on IGVM library")
was inconsistent with the contents of meson_options.txt and the one
generated in scripts/meson-buildoptions.sh

Let's regenerate the file in this way to keep them consistent and prevent
future changes from including the spurious diff:

    touch meson_options.txt
    make update-buildoptions

Fixes: 84fe49d94a ("meson: Add optional dependency on IGVM library")
Cc: roy.hopkins@randomman.co.uk
Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20250717131256.157383-1-sgarzare@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>