setup_links.py: Add third_party/libFuzzer

This solves the GN error starting after rolling in
https://chromium.googlesource.com/chromium/src/+/cbd1cf202d289ccaf76aa67828e9425e5a061d6b
as part of https://codereview.webrtc.org/1855003002

BUG=chromium:591955
TBR=pbos@webrtc.org
TESTED=Ran the gn gen and refs steps locally + compiled succesfully.

Review URL: https://codereview.webrtc.org/1857673002 .

Cr-Commit-Position: refs/heads/master@{#12211}
diff --git a/setup_links.py b/setup_links.py
index 681f9cc..6df0c30 100755
--- a/setup_links.py
+++ b/setup_links.py
@@ -45,6 +45,7 @@
   'third_party/instrumented_libraries',
   'third_party/jsoncpp',
   'third_party/libc++-static',
+  'third_party/libFuzzer',
   'third_party/libjpeg',
   'third_party/libjpeg_turbo',
   'third_party/libsrtp',