really remove externs

lib/asm/arm/arm_assembler.rb

@@ -35,7 +35,7 @@ module Asm
             node.args << add_string(arg)
           elsif (arg.is_a?(Symbol))
             node.args << Asm::LabelRefNode.new(arg.to_s)
-          elsif (arg.is_a?(Asm::Arm::GeneratorLabel) or arg.is_a?(Asm::Arm::GeneratorExternLabel))
+          elsif (arg.is_a?(Asm::Arm::GeneratorLabel))
             node.args << arg
           else
             raise 'Invalid argument `%s\' for instruction' % arg.inspect
@@ -65,17 +65,6 @@ module Asm
         }
       }
 
-      #externs dropped for now
-      def extern(sym)
-        if (lbl = @externs.find { |extern| extern.name == sym })
-          lbl
-        else
-          @externs << lbl = Asm::Arm::GeneratorExternLabel.new(sym)
-          add_value lbl
-          lbl
-        end
-      end
-
       def assemble_to_string
         #put the strings at the end of the assembled code.
         # adding them will fix their position and make them assemble after

lib/asm/arm/generator_label.rb

@@ -15,11 +15,3 @@ class Asm::Arm::GeneratorLabel < Asm::LabelObject
     self
   end
 end
-
-class Asm::Arm::GeneratorExternLabel < Asm::LabelObject
-  def initialize(name)
-    @name = name
-    extern!
-  end
-  attr_reader :name
-end