Rename Init_pathname to differentiate from ext/pathname

Author: nobu

inits.c

@@ -69,7 +69,7 @@ rb_call_inits(void)
     CALL(Rational);
     CALL(Complex);
     CALL(MemoryView);
-    CALL(pathname);
+    CALL(pathname_builtin);
     CALL(version);
     CALL(vm_trace);
     CALL(vm_stack_canary);

pathname.c

@@ -1499,18 +1499,18 @@ static void init_ids(void);
  * information.  In some cases, a brief description will follow.
  */
 void
-Init_pathname(void)
+Init_pathname_builtin(void)
 {
 #ifdef HAVE_RB_EXT_RACTOR_SAFE
     rb_ext_ractor_safe(true);
 #endif
 
     init_ids();
-    InitVM(pathname);
+    InitVM(pathname_builtin);
 }
 
 void
-InitVM_pathname(void)
+InitVM_pathname_builtin(void)
 {
     rb_cPathname = rb_define_class("Pathname", rb_cObject);
     rb_define_method(rb_cPathname, "initialize", path_initialize, 1);