meson, configure: move --enable-module-upgrades to meson

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson_options.txt b/meson_options.txt
index 65f7010..af432a4 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -34,6 +34,8 @@
        description: 'build fuzzing targets')
 option('gettext', type : 'feature', value : 'auto',
        description: 'Localization of the GTK+ user interface')
+option('module_upgrades', type : 'boolean', value : false,
+       description: 'try to load modules from alternate paths for upgrades')
 option('install_blobs', type : 'boolean', value : true,
        description: 'install provided firmware blobs')
 option('sparse', type : 'feature', value : 'auto',