We should be safe to do 32-bit syscalls from 64bit again.
remove callno param from check_if_fd
remove pointless local var
print out the fd as an int.
factor out the stuck syscall info to own function
check return from kill, just in case
signal handler improvements.

When the alarm goes off, check if we're stuck in an fd.
print out pid in ENOSYS output
when we get back from the signal handler, print what happened in the child.

Ignore SIGALRM, it'll happen too often.
fix up corner case where trinity binary got accidentally chmod'd.