The functions are not relevant for most sanitizers and only required for
MSan to see which regions have been written to. This eliminates a link
dependency for all other sanitizers and fixes#59007: while `-lresolv`
had been added for the static runtime in 6dce56b2a3, it wasn't added
to the shared runtimes.
Instead of just moving the interceptors, we adapt them to MSan
conventions:
* We don't skip intercepting when `msan_init_is_running` is true, but
directly call ENSURE_MSAN_INITED() like most other interceptors. It
seems unlikely that these functions are called during initialization.
* We don't unpoison `errno`, because none of the functions is specified
to use it.
f5f965058a