remove_spec

# File lib/rubygems/specification.rb, line 1275
  def self.remove_spec spec
    warn "Gem::Specification.remove_spec is deprecated and will be removed in RubyGems 3.0" unless Gem::Deprecate.skip
    _all.delete spec
    stubs.delete_if { |s| s.full_name == spec.full_name }
    (@@stubs_by_name[spec.name] || []).delete_if { |s| s.full_name == spec.full_name }
    reset
  end