[commit] setshow fprint_setshow and show_func parameters

[Andrew Cagney]

The add_setshow_* functions currently take two parameters for printing a 
value, each possibly called in turn.  For instance "show remote 
P-packet" prints:

   Current use of remote protocol `P' (set-register) packet is auto.
   Support for remote protocol `P' (set-register) packet is 
auto-detected, currently unknown.

The first line is from fprint_showfunc (well should be), and the second 
from show_func.

This patch simplifies things by merging these two functions into a 
single show_value function responsible for printing the entire output. 
Any existing show_func / fprint_setshow functions are then updated (I 
added deprecated_show_value_hack to simplify that step).

I'll follow up with a patch to remove the now defunct fprint_setshow 
parameter (I kept it separate to make this patch simpler).

committed,
Andrew
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