[Bug c/88645] Don't assume functions are always nonnull if there's __attribute__((weak_import)), similar to __attribute__((weak))

[mcccs at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88645

--- Comment #1 from MCCCS <mcccs at gmx dot com> ---
Typo: fix can be added to "decl_with_nonnull_addr_p"
of "/c-family/c-common.c" if anyone is interested.