dri: move private __DRIDriverVtableExtension out of dri_interface.h

It's only used internally.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19741>

include/GL/internal/dri_interface.h

@@ -1856,23 +1856,6 @@ typedef struct __DRIconfigOptionsExtensionRec {
    char *(*getXml)(const char *driver_name);
 } __DRIconfigOptionsExtension;
 
-/**
- * This extension provides a driver vtable to a set of common driver helper
- * functions (driCoreExtension, driDRI2Extension) within the driver
- * implementation, as opposed to having to pass them through a global
- * variable.
- *
- * It is not intended to be public API to the actual loader, and the vtable
- * layout may change at any time.
- */
-#define __DRI_DRIVER_VTABLE "DRI_DriverVtable"
-#define __DRI_DRIVER_VTABLE_VERSION 1
-
-typedef struct __DRIDriverVtableExtensionRec {
-    __DRIextension base;
-    const struct __DriverAPIRec *vtable;
-} __DRIDriverVtableExtension;
-
 /**
  * Query renderer driver extension
  *

src/gallium/frontends/dri/dri_util.h

@@ -62,6 +62,13 @@
 #include "util/xmlconfig.h"
 #include <stdbool.h>
 
+#define __DRI_DRIVER_VTABLE "DRI_DriverVtable"
+
+typedef struct __DRIDriverVtableExtensionRec {
+    __DRIextension base;
+    const struct __DriverAPIRec *vtable;
+} __DRIDriverVtableExtension;
+
 struct __DRIconfigRec {
     struct gl_config modes;
 };