Temporarily skipping examples/* from gn check.

TBR=phoglund@webrtc.org

Bug: webrtc:8850
Change-Id: Ie27367628ab5bb72529fd337df46a6ace1f96d5f
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/48560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21911}

.gn

@@ -28,7 +28,9 @@ check_targets = [
   "//call/*",
   "//common_audio/*",
   "//common_video/*",
-  "//examples/*",
+
+  # TODO(bugs.webrtc.org/8850): re-enable when 'gn check' will be fixed.
+  # "//examples/*",
   "//logging/*",
   "//media/*",
   "//modules/*",