[Bug testsuite/65126] [5 Regresion] additional_sources not defined anymore during dg-final

[mkuvyrkov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65126

--- Comment #3 from Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> ---
Hi Tom,

I can't reproduce this.  I'm trying "make check-gcc RUNTESTFLAGS="vect.exp"" on
a native x86_64 bootstrap.

What is required to trigger this?

[FWIW, I see that code handling additional_source has different paths for
remote vs local testing, so it might be triggered only with remote testing.]