Support signal frame unwinding on AArch64

[K0u1e]

#341

Describe your changes
add patch for elfutils to unwind signal frame on aarch64

Testing performed
run test in issue and see

    (C) File "./Modules/clinic/posixmodule.c.h", line 5649, in os_kill.lto_priv.0 (/usr/local/python3.14t/lib/libpython3.14t.so.1.0)
    (C) File "./Modules/posixmodule.c", line 9666, in os_kill_impl (inlined) (/usr/local/python3.14t/lib/libpython3.14t.so.1.0)
    (C) File "../sysdeps/unix/syscall-template.S", line 120, in kill (/usr/lib/aarch64-linux-gnu/libc.so.6)
    (C) File "???", line 0, in __kernel_rt_sigreturn ([vdso: 492437])
    (C) File "/usr/lib/aarch64-linux-gnu/libffi.so.8.1.2", line 0, in ??? (/usr/lib/aarch64-linux-gnu/libffi.so.8.1.2)
    (C) File "/usr/lib/aarch64-linux-gnu/libffi.so.8.1.2", line 0, in ??? (/usr/lib/aarch64-linux-gnu/libffi.so.8.1.2)
    (C) File "./Modules/_ctypes/callbacks.c", line 302, in closure_fcn (/usr/local/python3.14t/lib/python3.14t/lib-dynload/_ctypes.cpython-314t-aarch64-linux-gnu.so)
    (C) File "./Modules/_ctypes/callbacks.c", line 210, in _CallPythonObject (/usr/local/python3.14t/lib/python3.14t/lib-dynload/_ctypes.cpython-314t-aarch64-linux-gnu.so)

Additional context
https://codebrowser.dev/llvm/libunwind/src/UnwindCursor.hpp.html#2810

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.56%. Comparing base (f607247) to head (907cfe2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #348   +/-   ##
=======================================
  Coverage   77.56%   77.56%           
=======================================
  Files          57       57           
  Lines        6611     6611           
  Branches      630      630           
=======================================
  Hits         5128     5128           
  Misses       1483     1483           

Flag	Coverage Δ
cpp	77.56% <ø> (ø)
python	77.56% <ø> (ø)

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[godlygeek]

OK, this looks like a small enough patch that I'd be willing to carry it in pystack for now, until this is addressed in elfutils proper.

@K0u1e would you mind amending your commit to add a Signed-off-by: line with your full name? See https://github.com/bloomberg/pystack/blob/main/CONTRIBUTING.md#contribution-licensing - we need that as an attestation that this code is yours, and that you're willing to offer it under the terms of the Apache 2 license we use.

If you amend your commit and push it up with that, I can take care of rebasing it and getting it past our lint checks.