bpf_dsl: Change bpf_dsl_unittests into actual standalone unit tests

sandbox/linux/seccomp-bpf/trap.h

Index: sandbox/linux/seccomp-bpf/trap.h
diff --git a/sandbox/linux/seccomp-bpf/trap.h b/sandbox/linux/seccomp-bpf/trap.h
index 63fff88b1d51deafe938acf4a38aee18946ab1e6..4073bfe1201caa067ba6728672b316e84d1227e0 100644
--- a/sandbox/linux/seccomp-bpf/trap.h
+++ b/sandbox/linux/seccomp-bpf/trap.h
@@ -53,9 +53,9 @@ class SANDBOX_EXPORT Trap : public bpf_dsl::TrapRegistry {
   // automatically as needed.
   Trap();
 
-  // The destructor is unimplemented. Don't ever attempt to destruct this
-  // object. It'll break subsequent system calls that trigger a SIGSYS.
-  ~Trap();
+  // The destructor is unimplemented as destroying this object would
+  // break subsequent system calls that trigger a SIGSYS.
+  ~Trap() = delete;
 
   static void SigSysAction(int nr, siginfo_t* info, void* void_context);