virtme build fails due to gcc bug

See this pipeline:

https://linux-media.pages.freedesktop.org/-/users/hverkuil/-/jobs/62561407/artifacts/report.htm#test-virtme32test-virtme

This ends with:

vmlinux.o: warning: objtool: .export_symbol+0x2dc98: data relocation to !ENDBR: stpcpy+0x0 Error running test. Final Summary not found

Googling gave me this:

https://lore.kernel.org/lkml/20240802093552.GG39708@noisy.programming.kicks-ass.net/T/

So this appears to be a gcc 14 issue. I suspect it is fine to just filter out this warning, and that should allow the virtme build to succeed again.