Allow another prctl call.

A change was made so that pthread_create is calling
prctl(PR_PAC_RESET_KEYS, ...) on aarch64. It's possible that other
seccomp policies might need to change to allow this.

Test: CrasherTest.seccomp_backtrace passes on aarch64.
Change-Id: I9c4d1b3dca5f19a6285bf904bb942f1f52e42bd0
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 144faee..93725b9 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -274,7 +274,7 @@
   }
 
   if (signo == 0) {
-    ASSERT_TRUE(WIFEXITED(status));
+    ASSERT_TRUE(WIFEXITED(status)) << "Terminated due to unexpected signal " << WTERMSIG(status);
     ASSERT_EQ(0, WEXITSTATUS(signo));
   } else {
     ASSERT_FALSE(WIFEXITED(status));