Various warning fixes for .NET 2003 cl /W4 to work barring one warning and for gcc -ansi -Wall -pedantic to be warning free:

const fixes and function prototype declarations matching the definition etc


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@5639 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Source/Modules/allocate.cxx

@@ -650,6 +650,7 @@ public:
   }
 
   virtual int destructorDeclaration(Node *n) {
+    (void)n;
     if (!inclass) return SWIG_OK;
     if (!extendmode) {
 	Setattr(inclass,"allocate:has_destructor","1");