Add zstd as a build dependency.

It is required by Perfetto's GN configs.

Bug: None
Change-Id: Ifec6a9b15e84937a4d007a240c081e5748ecfe1f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/491940
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48233}

DEPS

diff --git a/DEPS b/DEPS
index acaebfe..f9f2bdb 100644
--- a/DEPS
+++ b/DEPS
@@ -818,7 +818,6 @@
 
   'src/third_party/zstd/src': {
     'url': Var('chromium_git') + '/external/github.com/facebook/zstd.git' + '@' + '5233c58e6ca0b1c4c6b353ad79649191ed195bdc',
-    'condition': 'checkout_android',
   },
 
   'src/tools/luci-go': {