compilation breaks with gnome support on hp-ux 11.00 (PR#1757)

[Gansser, Martin]

> mgansser@rand.de writes:
> 
> > cc: "system-showfiles.c", line 271: error 1502: Array size 
> must be a constant
> > expression.
> > gmake[4]: *** [system-showfiles.lo] Error 1
> > 
> > gnome-1.4 for hpux 11.00
> > PS: R-1.5.1 compiles fine w/o gnome support
> 
> Hmm:
> 
>   const gint bufsize = 2048;
>   gchar buf[bufsize];
> 
> is the culprit, so a quick fix should be obvious (just use #define
> instead). But is this usage of "const" variables an un-ANSI C
> extension in GCC, or is it the HP C compiler that is to blame??
> 
> -- 
>    O__  ---- Peter Dalgaard             Blegdamsvej 3  
>   c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
>  (*) \(*) -- University of Copenhagen   Denmark      Ph: 
> (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: 
> (+45) 35327907

occurs only, if CC=cc (HP C compiler) is set, not with CC=gcc
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