Add cookie_use flag

https://github.com/Hamlib/Hamlib/issues/695

include/hamlib/rig.h

@@ -112,6 +112,7 @@ __BEGIN_DECLS
  */
 // cookie is 26-char time code plus 10-char (2^31-1) random number
 #define HAMLIB_COOKIE_SIZE 37
+extern int cookie_use;  // this is global as once one client requests it everybody needs to honor it
 
 //! @cond Doxygen_Suppress
 extern HAMLIB_EXPORT_VAR(const char) hamlib_version[];

src/rig.c

@@ -88,6 +88,7 @@ const char *hamlib_license = "LGPL";
 //! @cond Doxygen_Suppress
 const char hamlib_version[21] = "Hamlib " PACKAGE_VERSION;
 const char *hamlib_version2 = "Hamlib " PACKAGE_VERSION " " HAMLIBDATETIME;
+int cookie_use;
 //! @endcond
 
 struct rig_caps caps_test;