use %.15g instead of %.10f for doubles (trac https://trac.osgeo.org/grass/ticket/335; merge from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@38756 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.what/main.c

@@ -398,7 +398,7 @@ int main(int argc, char *argv[])
 			fprintf(stdout, "%c%s", fs, null_str);
 			continue;
 		    }
-		    sprintf(tmp_buf, "%.10f", cache[point].dvalue[i]);
+		    sprintf(tmp_buf, "%.15g", cache[point].dvalue[i]);
 		    G_trim_decimal(tmp_buf);
 		    fprintf(stdout, "%c%s", fs, tmp_buf);
 		}