Fix Ruby 3.3 / GCC 15 incompatible pointer type error

[edusantana]

Problem

GCC 15 (shipped with Ubuntu 26.04) promotes -Wincompatible-pointer-types to a hard error. Two files use RubyInline to compile C extensions at load time, and both trigger this error with Ruby 3.3's updated rb_define_method union-based callback type:

• lib/fuzzy_tools/helpers.rb — inline C soundex
• lib/fuzzy_tools/weighted_document_tokens.rb — inline C cosine_similarity_fast

Both files already have a complete pure-Ruby fallback used for JRuby/rbx. The fix extends that fallback to also apply on MRI 3.3+, where the C extensions no longer compile.

Fix

One-line change per file — extend the existing condition:

# before
if RUBY_DESCRIPTION !~ /^ruby/  # rbx, jruby

# after
if RUBY_DESCRIPTION !~ /^ruby/ || RUBY_VERSION >= '3.3'  # rbx, jruby, or MRI 3.3+

Tested on

• Ruby 3.3.7 / Ubuntu 26.04 LTS / GCC 15.2 ✅
• Pure-Ruby soundex and cosine_similarity produce correct results (existing pure-Ruby path was already battle-tested for JRuby)