[ruby-core:115404] Ruby 3.2.2 - rbconfig.rb's MAKEFILE_CONFIG

Hello Ruby Dev Team,
With Ruby 3.2.2, gem install fails because in rbconfig.rb,
MAKEFILE_CONFIG's $(target_os) is not expanded (whereas CONFIG's is
expanded correctly).

The inline doc in mkconfig.rb states that the caller can expand
MAKEFILE_CONFIG's values by calling RbConfig::expand().

However, ruby-shadow gem's Makefile generator -- extconf.rb -- does not
call expand and directly uses mkmf.rb's CONFIG instance (which is
RbConfig::MAKEFILE_CONFIG), because of which $(target_os) does not get
expanded.
This causes ruby-shadow gem install to fail with Ruby 3.2.2.

Would the Ruby Dev Team accept the following proposal to fix mkconfig.rb,
so that the generated rbconfig.rb instantiates MAKEFILE_CONFIG AFTER
CONFIG's values have been expanded?

  # Existing code...
  CONFIG.each_value do |val|
    RbConfig::expand(val)
  end
  # Move instantiation of MAKEFILE_CONFIG after expanding CONFIG's values.
  MAKEFILE_CONFIG = {}
  CONFIG.each{|k,v| MAKEFILE_CONFIG[k] = v.dup}

If we fix it in mkconfig.rb, we can avoid callers having to explicitly call
expand for MAKEFILE_CONFIG's values.

Thanks.
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