Disable -Wsentinel warning for Linux 32-bit builds.

webrtc/examples/BUILD.gn

Index: webrtc/examples/BUILD.gn
diff --git a/webrtc/examples/BUILD.gn b/webrtc/examples/BUILD.gn
index de88afb1defc9feaff787d3edb21a8ee74fced3f..4c920c91b0b5319f8e3ebb30eaee0686a4cb28e8 100644
--- a/webrtc/examples/BUILD.gn
+++ b/webrtc/examples/BUILD.gn
@@ -402,6 +402,12 @@ if (is_linux || is_win) {
         "-Wno-sign-compare",
       ]
     }
+    if (is_linux && target_cpu == "x86") {
+      cflags = [
+        # Needed to compile on Linux 32-bit.
+        "-Wno-sentinel",
+      ]
+    }
   }
 
   rtc_executable("peerconnection_client") {
@@ -453,6 +459,7 @@ if (is_linux || is_win) {
       deps += [ "//third_party/jsoncpp" ]
     }
   }
+
   rtc_executable("peerconnection_server") {
     sources = [
       "peerconnection/server/data_socket.cc",