[GRASS5] Small fix for newer gccs (e.g. 2.95.2)

Found and fixed a small problem which is only hit by newer gccs.
It prevented me to compile the FreeGIS .src.rpm on the GNU/Linux/PPC
system here, which runs gcc 2.95.3 now.

RCS file: /grassrepository/grass/src/libes/geom/basic/cb_doprnt.c,v

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revision 1.2
date: 2000/05/09 20:06:42; author: bernhard; state: Exp; lines: +2 -2
Using the type "char" for va_arg() is illegal in standard C.
Therefore I changed it to "int".
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  Bernhard

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