rtc_unittest: prevent execution of broken tests.

BUG=1976
R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/29509004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7193 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/tools/valgrind-webrtc/gtest_exclude/rtc_unittests.gtest-memcheck.txt b/tools/valgrind-webrtc/gtest_exclude/rtc_unittests.gtest-memcheck.txt
new file mode 100644
index 0000000..a37f70f
--- /dev/null
+++ b/tools/valgrind-webrtc/gtest_exclude/rtc_unittests.gtest-memcheck.txt
@@ -0,0 +1,5 @@
+# Fails when run under memcheck
+# https://code.google.com/p/webrtc/issues/detail?id=1976
+PhysicalSocketTest.TestUdpReadyToSendIPv4
+ThreadTest.Release
+