[tsan] Suppress all of libpulsecommon*.so, following chromium.

Hide benign data race in libpulse init.
Mirror what have been done here:
https://chromium-review.googlesource.com/c/chromium/src/+/690578/

Bug: chromium:244856
Change-Id: If9aa871ca3405141f2a62622704b6805cdda5fac
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/146545
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Yves Gerey <yvesg@google.com>
Cr-Commit-Position: refs/heads/master@{#28640}

tools_webrtc/sanitizers/tsan_suppressions_webrtc.cc

@@ -65,6 +65,9 @@ char kTSanDefaultSuppressions[] =
     "race:*RTCStatsIntegrationTest_GetsStatsWhileDestroyingPeerConnections_"
     "Test::TestBody\n"
 
+    // http://crbug.com/244856
+    "race:libpulsecommon*.so\n"
+
     // End of suppressions.
     ;  // Please keep this semicolon.