like Tru64 with __sys_siglist but no strsignal function.
* stat.c now compiles on Ultrix systems
* mv now removes `a' in this example on all systems: touch a; ln a b; mv a b
- This behavior is contrary to POSIX, but I suspect POSIX will change.
+ This behavior is contrary to POSIX (which requires that the mv command do
+ nothing and exit successfully), but I suspect POSIX will change.
[5.0]
* false --help now exits nonzero