Remove mj_activate and mj_deactivate.

PiperOrigin-RevId: 538799120
Change-Id: I4d6729131e20ab9ae15c94c221ba83ae5732e942

src/xml/xml_api.cc

@@ -62,26 +62,14 @@ void GlobalModel::Clear() {
 }
 
 
-
 // single instance of global model, protected with mutex
 static GlobalModel themodel;
 static std::mutex themutex;
 
+
+
 //---------------------------------- Functions -----------------------------------------------------
 
-// Return 1 (for backward compatibility).
-int mj_activate(const char* filename) {
-  return 1;
-}
-
-
-
-// Do nothing (for backward compatibility).
-void mj_deactivate(void) {
-}
-
-
-
 // mj_loadXML helper function
 mjModel* _loadXML(const char* filename, int vfs_provider,
                   char* error, int error_sz) {

src/xml/xml_api.h

@@ -23,11 +23,6 @@ extern "C" {
 #endif
 
 
-// activate license, call mju_error on failure; return 1 if ok, 0 if failure
-MJAPI int mj_activate(const char* filename);
-
-// deactivate license, free memory
-MJAPI void mj_deactivate(void);
 
 // parse XML file in MJCF or URDF format, compile it, return low-level model
 //  if vfs is not NULL, look up files in vfs before reading from disk