remove non ascii character §, which leads to compiler warnings

src/frontend/inpcom.c

@@ -8502,14 +8502,14 @@ static void inp_check_syntax(struct card *deck)
         if (*cut_line == '*' || *cut_line == '\0')
             continue;
         // check for unusable leading characters and change them to '*'
-        if (strchr("=[]?()&%$§\"!:,", *cut_line)) {
+        if (strchr("=[]?()&%$\"!:,", *cut_line)) {
             if (ft_stricterror) {
                 fprintf(stderr, "Error: '%c' is not allowed as first character in line %s.\n", *cut_line, cut_line);
                 controlled_exit(EXIT_BAD);
             }
             else {
                 if (!check_ch) {
-                    fprintf(stderr, "Warning: Unusal leading characters like '%c' or others out of '= [] ? () & %$§\"!:,'\n", *cut_line);
+                    fprintf(stderr, "Warning: Unusal leading characters like '%c' or others out of '= [] ? () & %$\"!:,'\n", *cut_line);
                     fprintf(stderr, "    in netlist or included files, will be replaced with '*'\n");
                     check_ch = 1; /* just one warning */
                 }