Mark death tests properly.

A few death tests are not set to silence tombstones, so fix
all of those occurrences.

Test: Ran all death tests and no tombstones generated.
Change-Id: If2b54b1a3432edbd54076439d40527d966607f70
diff --git a/tests/fcntl_test.cpp b/tests/fcntl_test.cpp
index 862f498..c1c586c 100644
--- a/tests/fcntl_test.cpp
+++ b/tests/fcntl_test.cpp
@@ -360,6 +360,6 @@
 #endif
 }
 
-TEST(fcntl_DeathTest, fcntl_F_SETFD) {
+TEST_F(fcntl_DeathTest, fcntl_F_SETFD) {
   EXPECT_DEATH(fcntl(0, F_SETFD, O_NONBLOCK), "non-FD_CLOEXEC");
 }