Allow explicitly requiring universal deps

Previously, instructing Homebrew that all dependencies should be built
universal could be accomplished by redefining BuildOptions#universal? in
the class body:

  def build.universal?
    true
  end

However, the build object is no longer shared by all specs, so this is
insufficient. Instead, a new DSL method, "require_universal_deps", can
be used.

This feature is almost exclusively for wine, which requires universal
deps but does not itself have a universal option, since it is always
built 32-bit.

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