EXT_SUFFIX, according to PEP 3149, refers to the full tag and
extension for compiled extension module objects, eg .cpython-311.so,
.cpython-313t.so, etc. We do not use the correct semantic meaning,
and this usage becomes ambiguous and confusing when tags do not
match between bytecode and compiled extension module objects.

Rename our PYTHON_EXT_SUFFIX to PYTHON_TAG to align with PEP 3147's
specification of a magic tag, which consists of implementation name
and shorthand version only. This is meant for bytecode and other
files containing this tag in their filename that do not depend on
a specific Python ABI for the same version. Chase all existing
consumers.

Introduce PYTHON_SOABI to align with PEP 3149's specification of a
tag, which consists of implementation name, shorthand version and
any ABI flags present (this and PYTHON_TAG are identical without
ABI flags). This is meant for compiled extension module objects and
other files that depend on a specific Python ABI for the same
version.

Add documentation for these variables that our PYTHON_EXT_SUFFIX
never had.

PR: 274671
Event: Kitchener-Waterloo Hackathon 202506

Reported by:		Michael Butler <imb@protected-networks.net>

- Pet Q/A check by removing unnused freetype lib depends

ChangeLog: https://github.com/oetiker/rrdtool-1.x/blob/master/CHANGES

Approved by:	portmgr (blanket)

Approved by:	portmgr (blanket)

Some symbols in the linker version script librrd.sym are undefined when
the CACHE option is off. Suppress errors with lld >= 17 due to these
undefined symbols.

PR:		273753
MFH:		2024Q1

Currently a no-op, but in the future outputs the correct setuptools
port depending on whether USES_PYTHON=distutils is specified.

With hat: python
PR: 270510, 270358

In my previous commit 18c6e18 I missed some ports where RUBY was
optional. This commit fixes those missing ports and fixes INDEX build.

Approved by:	portmgr
Fixes: 18c6e18 Mk/**ruby.mk: Switch from USE_RUBY=yes to USES=ruby