lang/python314: Security update + other fixes

Fix critical use-after-free bug in LZMA/BZ2/ZLib decompressor routines
when reusing decompressor instances after a MemoryError was raised from
one.

While here:

• fix DEBUG build/package (several %%ABI%% were in the wrong place in pkg-plist that caused failed installs)
• switch to using system textproc/expat2 library
• issue warnings in pre-test that IPV6, PYMALLOC are required and DEBUG also breaks one self-test
• bump PORTREVISION
• drop LTOFULL again and make LTO use =full

References:
https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3
https://www.cve.org/CVERecord?id=CVE-2026-6100
https://github.com/python/cpython/pull/148396

Obtained from: GitHub repo

		https://github.com/python/cpython/commit/c8d8173c4b06d06902c99ec010ad785a30952880

Security: CVE-2026-6100

		b8e9f33c-375d-11f1-a119-e36228bfe7d4