[Bug lto/63998] gcc.dg/lto/pr60820 fails on darwin

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63998

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Maybe the testcase misses { dg-require-weak "" }?  Not sure if that works for
lto.exp though - can you check?