Bug#1102644: luanti FTCBFS: fails creating /minetest

[Travis Wrightsman]

Hi Helmut,

I forwarded your patch to upstream, who requested changes that keep the
conditional for cross-building. Maybe you'd like to comment on the pull
request with your thoughts in case you disagree, since I am not as
familiar with cross building as you are.

https://github.com/luanti-org/luanti/pull/16030

Best,
Travis