bug#46314: Fix build of materialdecoration.

[Leo Prikler]

Hi Raghav,

Am Montag, den 15.02.2021, 12:41 -0500 schrieb Raghav Gururajan:
> Thanks for the review. I have attached revised patches.
Thanks for the patches.  I've pushed them upstream, so I'll be closing
this and 46314.

Regards,
Leo