GDB arm-netbsd build failure.

[Michael Snyder]

Richard Earnshaw wrote:
> 
> > An arm-elf cross build now fails when building opcodes/arm-dis.c since the
> > one of the prototypes you added in elf-bfd.h uses pid_t, which isn't
> > defined at that point.
> 
> Hmm, thinking about it, pid_t is a very Unix-centric type anyway; so it is
> somewhat dubious that this appears at all in the BFD libraries.

You're right -- I'll change the function signiture.