fully parallelize the Disassemble builder

spec/build_tests_spec.rb

@@ -439,10 +439,15 @@ EOF
 
   it "supports disassembling object files" do
     test_dir("simple")
+
     result = run_test(rsconsfile: "disassemble.rb")
     expect(result.stderr).to eq ""
     expect(File.exists?("simple.txt")).to be_truthy
     expect(File.read("simple.txt")).to match /Disassembly of section .text:/
+
+    result = run_test(rsconsfile: "disassemble.rb")
+    expect(result.stderr).to eq ""
+    expect(result.stdout).to eq ""
   end
 
   it "supports preprocessing C sources" do

spec/rscons/builders/disassemble_spec.rb

@@ -1,17 +0,0 @@
-module Rscons
-  module Builders
-    describe Disassemble do
-      let(:env) {Environment.new}
-      subject {Disassemble.new}
-
-      it "supports overriding DISASM_CMD construction variable" do
-        cache = "cache"
-        allow(cache).to receive(:up_to_date?) { false }
-        allow(cache).to receive(:mkdir_p) { }
-        allow(cache).to receive(:register_build) { }
-        expect(env).to receive(:execute).with("Disassemble a_file.txt", ["my_disasm", "a_file.exe"], anything).and_return(true)
-        subject.run("a_file.txt", ["a_file.exe"], cache, env, "DISASM_CMD" => ["my_disasm", "${_SOURCES}"])
-      end
-    end
-  end
-end