Mark cctests that don't use deprecated APIs as such

test/cctest/gay-precision.cc

Index: test/cctest/gay-precision.cc
diff --git a/test/cctest/gay-precision.cc b/test/cctest/gay-precision.cc
index 68d29f8cd547661c457f7b1b912fb6f71d3fe456..538c79ff852b37b8b8c744599363a30f3c63699d 100644
--- a/test/cctest/gay-precision.cc
+++ b/test/cctest/gay-precision.cc
@@ -29,6 +29,9 @@
 // have been generated using Gay's dtoa to produce the precision representation:
 //         dtoa(v, 2, number_digits, &decimal_point, &sign, NULL);
 
+// TODO(jochen): Remove this after the setting is turned on globally.
+#define V8_IMMINENT_DEPRECATION_WARNINGS
+
 #include "src/v8.h"
 
 #include "test/cctest/gay-precision.h"