glx: move up glx_driver enum declaration

Fixes: 4e8740370a ("glx: rework __glXInitialize")

Acked-by: Eric Engestrom <eric@igalia.com>
Reported-by: Yurii Kolesnykov <root@yurikoles.com>
Tested-by: Yurii Kolesnykov <root@yurikoles.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30449>

src/glx/glxclient.h

@@ -35,6 +35,17 @@
 #include "loader.h"
 #include "glxextensions.h"
 
+/* bits */
+enum glx_driver {
+   GLX_DRIVER_NONE = 0,
+   GLX_DRIVER_ZINK_INFER = (1<<0),
+   GLX_DRIVER_SW = (1<<1),
+   GLX_DRIVER_DRI2 = (1<<2),
+   GLX_DRIVER_DRI3 = (1<<3),
+   GLX_DRIVER_WINDOWS = (1<<4),
+   GLX_DRIVER_ZINK_YES = (1<<5),
+};
+
 #if USE_LIBGLVND
 #define _GLX_PUBLIC _X_HIDDEN
 #else
@@ -120,17 +131,6 @@ struct __GLXDRIdrawableRec
    int refcount;
 };
 
-/* bits */
-enum glx_driver {
-   GLX_DRIVER_NONE = 0,
-   GLX_DRIVER_ZINK_INFER = (1<<0),
-   GLX_DRIVER_SW = (1<<1),
-   GLX_DRIVER_DRI2 = (1<<2),
-   GLX_DRIVER_DRI3 = (1<<3),
-   GLX_DRIVER_WINDOWS = (1<<4),
-   GLX_DRIVER_ZINK_YES = (1<<5),
-};
-
 /*
 ** Function to create and DRI display data and initialize the display
 ** dependent methods.