End-of-life [^_]deprecated_registers[^_] in GDB 6.3

[Andrew Cagney]

The global variable deprecated_registers was clearly marked as such in 
'02.  It was in the bad books for a lot longer, but that's the point at 
which we can say that the line was clearly drawn :-)  As such, it's time 
to remove it.

This has the potential to adversly affect the following files/systems:

hppah-nat.c
hpux-thread.c
i386gnu-nat.c
ia64-aix-nat.c
ia64-linux-nat.c
irix5-nat.c
lynx-nat.c
mips-linux-tdep.c
mipsv4-nat.c
ns32knbsd-nat.c
ppc-bdm.c
regcache.c
regcache.h
remote-sds.c
remote-vx68.c
remote-vxmips.c
rs6000-tdep.c
v850ice.c

(based on a mindless grep)

Andrew