[libgfortran,patch] Remove never-used debugging code

[FX]

> Certainly, the dead code can go.  But,is this changing the library ABI?
> 
> troutmask:fvwm:kargl[764] nm /mnt/sgk/work/6/lib/libgfortran.a | grep show_
> 0000000000000000 T _gfortrani_show_variables
> 0000000000000000 t show_boolean
> 0000000000000000 t show_integer
> 0000000000000000 t show_sep
> 0000000000000000 t show_string
> 0000000000000000 T _gfortrani_show_locus

Nope, none of those functions are actually publicly exported. They are not in gfortran.map, being either static, or having _gfortrani_ prefix which means internal libgfortran use.

FX