Ruby

pack.c: remove wasted allocation in BER integer packing

The 'w' format (BER compressed integer) was allocating an empty
string with rb_str_new(0, 0) then immediately overwriting it with
the correctly-sized allocation. Remove the wasted first allocation.
...

Remove RUBY_API_VERSION check in cxxanyargs.hpp

The version check used undefined macros, causing -Wundef warnings.
The conditional is no longer needed as Ruby is past version 3.1.

Disambiguate private and public RSTRUCT_ helpers

RSTRUCT_LEN / RSTRUCT_GET / RSTRUCT_SET all existing in two
versions, one public that does type and frozens checks
and one private that doesn't.

The problem is that this is error prone because the public version...

Push the commits to the origin at make matz [ci skip]

Fix VCS::GIT#branch_beginning to search since the last relase

The ChangeLog in ruby-4.0.0 did not contain entries for 3.5.0.

Relax the flaky test threshold on RHEL 10.0 x86_64

[DOC] Improve docs for Module#>=

[DOC] Improve docs for Module#<=

[DOC] Improve docs for Module#<

[DOC] Improve docs for Module#>