glx: Handle IGNORE_GLX_SWAP_METHOD_OML regardless of GLX_USE_APPLEGL

Avoids tons of

 WARNING: unknown fbconfig attribute from server: tag 0x8060 value 0x8063

messages with LIBGL_DEBUG=verbose.

Fixes: e64ab3e4a9 ("glx: Delete support for GLX_OML_swap_method.")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26685>
(cherry picked from commit f0594915e6)

.pick_status.json

@@ -514,7 +514,7 @@
         "description": "glx: Handle IGNORE_GLX_SWAP_METHOD_OML regardless of GLX_USE_APPLEGL",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "e64ab3e4a94c4e8baee3bec3a5eb4d098b8e7193",
         "notes": null

src/glx/glxext.c

@@ -563,12 +563,11 @@ __glXInitializeVisualConfigFromTags(struct glx_config * config, int count,
       case GLX_SAMPLES_SGIS:
          config->samples = *bp++;
          break;
-#ifdef GLX_USE_APPLEGL
       case IGNORE_GLX_SWAP_METHOD_OML:
          /* We ignore this tag.  See the comment above this function. */
          ++bp;
          break;
-#else
+#ifndef GLX_USE_APPLEGL
       case GLX_BIND_TO_TEXTURE_RGB_EXT:
          config->bindToTextureRgb = *bp++;
          break;