tsan: add missing include


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@160875 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/tsan/go/test.c b/lib/tsan/go/test.c
index 34d68ea..5ef81be 100644
--- a/lib/tsan/go/test.c
+++ b/lib/tsan/go/test.c
@@ -11,6 +11,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <stdio.h>
+
 void __tsan_init();
 void __tsan_fini();
 void __tsan_go_start(int pgoid, int chgoid, void *pc);