meson: Don't try to build GLX by default on Android.

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7227>
diff --git a/meson.build b/meson.build
index a4aec17..2e1d4ac 100644
--- a/meson.build
+++ b/meson.build
@@ -350,7 +350,9 @@
 
 with_glx = get_option('glx')
 if with_glx == 'auto'
-  if with_dri
+  if with_platform_android
+    with_glx = 'disabled'
+  elif with_dri
     with_glx = 'dri'
   elif with_platform_haiku
     with_glx = 'disabled'