Revert "Pass the syscall number to capsicum permission-denied signals"

This broke the i386 build.

This reverts commit 3a522ba1bc.

sys/arm/arm/syscall.c

@@ -108,7 +108,6 @@ cpu_fetch_syscall_args(struct thread *td)
 	nap = 4;
 	sa = &td->td_sa;
 	sa->code = td->td_frame->tf_r7;
-	sa->original_code = sa->code;
 	ap = &td->td_frame->tf_r0;
 	if (sa->code == SYS_syscall) {
 		sa->code = *ap++;

sys/arm/cloudabi32/cloudabi32_sysvec.c

@@ -78,7 +78,6 @@ cloudabi32_fetch_syscall_args(struct thread *td)
 
 	/* Obtain system call number. */
 	sa->code = frame->tf_r12;
-	sa->original_code = sa->code;
 	if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
 		return (ENOSYS);
 	sa->callp = &cloudabi32_sysent[sa->code];

sys/arm/include/proc.h

@@ -75,7 +75,6 @@ struct mdproc {
  */
 struct syscall_args {
 	u_int code;
-	u_int original_code;
 	struct sysent *callp;
 	register_t args[MAXARGS];
 } __aligned(8);