In general we just try to include <not-cancel.h> once, thus avoiding
any issues with multiple inclusion.
However, the getaddrinfo sources are somewhat tangled, and .c files
include each other to get the final result. Each .c file currently has
its own include of <not-cancel.h>. While you could properly re-factor
this for the case of gai.c, the posix/tst-rfc3484.c tests directly include
one of the sub-files (sysdeps/posix/getaddrinfo.c), and it starts to
feel fragile.
Just like the other architectures, we need to avoid adding the
padding fields for the time_t fields in shmid_ds and msqid_ds.
The linux-generic versions are exactly like the x86_64 versions,
except I added a missing #include <bits/wordsize.h> in <bits/msq.h>.
