Auto-sync with upstream branch release/2.27/master
    
    Upstream commit: 7602b9e48c30c146d52df91dd83e518b8d0d343b
    
    - math: Fix parameter type in C++ version of iseqsig (swbz#23171)
    - Use _STRUCT_TIMESPEC as guard in <bits/types/struct_timespec.h> (swbz#23349)
    - getifaddrs: Don't return ifa entries with NULL names (swbz#21812)
    - libio: Disable vtable validation in case of interposition (swbz#23313)
    - stdio-common/tst-printf.c: Remove part under a non-free license (swbz#23363)