Ensure that equals options get parsed properly

Options such as --userimg=<path> should be parsed as an option with an
equals in its name ("userimg=") and without the path argument in
Option.name

Closes Homebrew/homebrew#34219.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/options.rb

@@ -58,7 +58,7 @@ class Options
   include Enumerable
 
   def self.create(array)
-    new array.map { |e| Option.new(e[/^--(.+)$/, 1] || e) }
+    new array.map { |e| Option.new(e[/^--([^=]+=?)(.+)?$/, 1] || e) }
   end
 
   def initialize(*args)