strace working

I have updated the strace source in our cvs, such that it now builds a basically working binary. It requires an up-to-date kernel.

Outstanding issues:

a) ioctl defines in linux/hppa/ioctlent.h are probably wrong
b) there is a hack in defs.h to get round a problem where the libc wrapper for ptrace() isn't getting used
c) there is a struct user defined in defs.h that should probably be in the kernel source asm/user.h
d) there are probably more places where we need to add HPPA specific code

Richard