remove commented out code in cpp-subprocess

src/util/subprocess.h

@@ -682,22 +682,6 @@ class Buffer
   explicit Buffer(size_t cap) { buf.resize(cap); }
   void add_cap(size_t cap) { buf.resize(cap); }
 
-#if 0
-  Buffer(const Buffer& other):
-    buf(other.buf),
-    length(other.length)
-  {
-    std::cout << "COPY" << std::endl;
-  }
-
-  Buffer(Buffer&& other):
-    buf(std::move(other.buf)),
-    length(other.length)
-  {
-    std::cout << "MOVE" << std::endl;
-  }
-#endif
-
 public:
   std::vector<char> buf;
   size_t length = 0;
@@ -974,15 +958,6 @@ class Popen
     execute_process();
   }
 
-/*
-  ~Popen()
-  {
-#ifdef __USING_WINDOWS__
-    CloseHandle(this->process_handle_);
-#endif
-  }
-*/
-
   int pid() const noexcept { return child_pid_; }
 
   int retcode() const noexcept { return retcode_; }