AOO42X: revert the Python 3.10 changes, keep arm64 support

The combined backport (cd15cd7435) brought both the macOS arm64 work and
a bundled-Python 2.7->3.10 baseline to AOO42X. Per decision, AOO42

AOO42X: revert the Python 3.10 changes, keep arm64 support

The combined backport (cd15cd7435) brought both the macOS arm64 work and
a bundled-Python 2.7->3.10 baseline to AOO42X. Per decision, AOO42X
should NOT carry the Python 3 migration (a release branch keeps its
known Python 2.7), but MUST keep the Apple Silicon support.

Verified none of the 5 Python-changed files contain any arch-specific
code and no arm64 file depends on the Python version, so reverting them
does not affect arm64 support. Restore to their pre-backport AOO42X
state (b4fbd80c76):
- python/pyversion.mk, pyversion_dmake.mk (back to 2.7.18)
- pyuno/source/loader/pythonloader.py (imp, file())
- scripting/source/pyprov/pythonscript.py (imp.new_module)
- scripting/source/pyprov/mailmerge.py (Py2 email module imports)

All arm64 changes (bridge, build plumbing, externals, packaging, JVM
discovery, the aoo-420-release.xml arm64 entry) are untouched. The Py3
work remains on trunk.

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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.

(cherry picked from commit 5e139d9fe42a654147771da4118aea6285c03168)

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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

(cherry picked from commit b4917d4af5d

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

(cherry picked from commit b4917d4af5d3ebad3c0056428a5595e1685e8e73)

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