Bump bundled OpenSSL 3.0.13 -> 3.0.20

Updates the bundled OpenSSL to the latest 3.0 LTS patch release, pulling
in all security fixes between 3.0.13 and 3.0.20. Stays within the 3.0 LTS
line for lowe

Bump bundled OpenSSL 3.0.13 -> 3.0.20

Updates the bundled OpenSSL to the latest 3.0 LTS patch release, pulling
in all security fixes between 3.0.13 and 3.0.20. Stays within the 3.0 LTS
line for lowest regression risk (no API/ABI changes).

Note: the 3.0 LTS branch reaches end-of-life on 2026-09-07; a follow-up
move to a newer LTS (e.g. 3.5) should be planned separately.

Changes:
- external_deps.lst: new tarball name, MD5, and download URL
(MD5 fabdcf86f3f54e27689253f85b738959, verified against upstream tarball).
- openssl/makefile.mk: OPENSSL_NAME and TARFILE_MD5.
- openssl/openssl.patch: rebased the Windows compatibility guards
(_WIN32_WINNT version checks in init.c / threads_win.c and the
IPPROTO_IPV6 fallback in bio_sock2.c) onto 3.0.20 sources; context had
shifted so the original hunks no longer applied.
- openssl/opensslunx.patch: bumped the embedded version path to 3.0.20.

Verified: declared MD5 matches the upstream tarball, and both the Unix
(opensslunx.patch) and Windows (openssl.patch) patch sets apply cleanly
to the 3.0.20 source tree via the build's "cd misc && patch -p2" step.
Platform compile/link/runtime still to be confirmed by CI.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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Native Apple Silicon (arm64) support and bundled Python 3.10 baseline

Squashed combination of two efforts, applied onto trunk as a single
commit. (trunk is not intended to be buildable; this lands t

Native Apple Silicon (arm64) support and bundled Python 3.10 baseline

Squashed combination of two efforts, applied onto trunk as a single
commit. (trunk is not intended to be buildable; this lands the work for
reference/integration.)

=== Apple Silicon (macOS arm64 / AAPCS64) ===
Build plumbing: set_soenv.in + source_soenv.sh arm64 Darwin branch
(CPU=R, CPUNAME=AARCH64, OUTPATH=unxmaccr); new solenv/inc/unxmaccr.mk
and unx.mk dispatch; macro.hxx AARCH64 arch string; osarch.pm +
gbuild/platform/macosx.mk arch entries; configure.ac arm64 host
detection, Big Sur+ version math, and 11.0 deployment target.

C++/UNO bridge (new s5abi_macosx_aarch64): abi.cxx/hxx AAPCS64 classifier
(HFA + <=16B/>16B size rules), uno2cpp + call.s AArch64 trampoline,
cpp2uno incoming path + privateSnippetExecutor + AArch64 codeSnippet
codegen (x8 indirect-result handled, not displacing this/x0), share.hxx
__cxa_exception reserved-member alignment fix; Library_cpp_uno.mk +
makefile.mk wiring. sal/osl/unx/interlck.c arm64 atomics (__sync_* ->
LSE).

Externals: openssl darwin64-arm64-cc; icu arm64 little-endian. (NSS 3.39
deferred -- too old for arm64.)

Packaging/JVM: Info.plist LSMinimumSystemVersion 11.0; installer
download.pm/worker.pm/update_module_ignore_lists.pl recognize unxmaccr;
jvmfwk modern macOS JDK discovery (/Library/Java/JavaVirtualMachines +
Contents/Home probe).

The ABI/atomics/trampoline/JDK-discovery code was unit-tested natively
on an arm64 macOS host; a full AOO build (and bridgetest) was not run.
Code-signing infra (mandatory for arm64 distribution) is NOT included.

=== Bundled Python 2.7.18 -> 3.10 baseline (Unix/macOS first) ===
pyversion.mk/_dmake.mk -> 3.10.18 (single version knob). Shipped .py
fixes: imp -> types.ModuleType (pythonscript.py, pythonloader.py) and
file() -> open(); mailmerge.py Py3 email module imports + encoders.
Windows Python 3 build and the makefile.mk/d.lst/configure.ac Py3 work
are NOT included (separate, larger effort).

NOTE: macOS 11 becomes the minimum supported version. Python 3.10 is
EOL 2026-10; the version knob allows a later bump.

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pre-commit auto whitespace clean up for `lst` files (#412)

For `lst` files enforced three hooks

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace