Re: sid cgen cpus broken by absence of pic libiberty

Two more concerns (gotta get it all out of my system):

- On multi-threaded programs, our call to setlocale could affect the
  behavior of other threads' calls to library functions.

- setlocale is part of ISO C99, but I don't know when it was added.
  Will we need to add autoconf machinery to make sure it's available?

I feel locale should be treated as a global variable under the user's
control, and not something we should be changing temporarily so we can
use locale-sensitive functions in a locale-independent way.  I don't
*like* the fact that isalnum is locale-sensitive, but that's not the
choice we have in front of us.