[Bug testsuite/115294] [15 regression] dg-additional-files-options change broke several testsuites

[ro at CeBiTec dot Uni-Bielefeld.DE via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115294

--- Comment #1 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot 
Uni-Bielefeld.DE> ---
I've identified the problem and tested a patch.  Will commit shortly.