[Bazel] Fix for Optionally print symbolizer markup backtraces.

Author: Dmitry Chernenkov

llvm/unittests/Support/SignalsTest.cpp

@@ -15,7 +15,6 @@
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/Config/config.h"
 #include "gmock/gmock.h"
-#include "gtest/gtest-matchers.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;