libc,shared: detect newer library symbols at runtime via weak references (#42065)

For libc syscall wrappers (pidfd_open, fsopen, openat2, etc.) we
previously
gated the calls behind build-time HAVE_* checks. Replace these with weak
external references, falling back to the raw syscall at runtime when the
loaded glibc lacks the symbol. Drop the corresponding cc.has_function()
loop
from meson.build and disable -Wredundant-decls /
readability-redundant-declaration
for src/libc/ via meson c_args and a local .clang-tidy.

For optional libraries (libcryptsetup, libdw, libarchive), drop the
per-symbol
HAVE_* checks. Always declare the prototypes, suppressing the
redundant-decl
warnings via DISABLE_WARNING_REDUNDANT_DECLS and NOLINT, and resolve the
symbols after the main dlopen via a new DLSYM_OPTIONAL() helper that
only
assigns on success. libarchive's *_is_set wrappers now use fallback
functions
as their pointer initializers, so call sites never need to NULL-check.

The same treatment applies to pidfd_spawn / posix_spawnattr_setcgroup_np
in
process-util.c and epoll_pwait2 in sd-event.c. coredump-config and
coredump-submit get a dlopen_dw_has_dwfl_set_sysroot() helper. The kexec
arch gate now uses defined(__NR_kexec_file_load) directly; pidfd.h uses
__has_include_next() to decide whether to pull in glibc's header.

This lets binaries built against newer glibc / libcryptsetup / libdw /
libarchive headers still load and run on older targets where these
symbols
are absent.