Remove "using namespace std" from compiler header files and fix the fallout.

load_module.cc

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2010 Stephen Williams ([email protected])
+ * Copyright (c) 2001-2021 Stephen Williams ([email protected])
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -32,6 +32,8 @@
 # include  <cassert>
 # include  "ivl_alloc.h"
 
+using namespace std;
+
 /*
  * The module library items are maps of key names to file name within
  * the directory.