Use value_to_c_string in print fns

They were previously using static buffers.

c/ton/main.c

JSValueRef function_print_fn(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	if (argc == 1 && JSValueIsString(ctx, args[0])) {
		JSStringRef val_str = JSValueToStringCopy(ctx, args[0], NULL);
		char buf[1000];
		JSStringGetUTF8CString(val_str, buf, 1000);
		char *str = value_to_c_string(ctx, args[0]);
		fprintf(stdout, "%s", buf);
		fprintf(stdout, "%s", str);
		fflush(stdout);
		free(str);
	}
	return JSValueMakeNull(ctx);
JSValueRef function_print_err_fn(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	if (argc == 1 && JSValueIsString(ctx, args[0])) {
		JSStringRef val_str = JSValueToStringCopy(ctx, args[0], NULL);
		char buf[1000];
		JSStringGetUTF8CString(val_str, buf, 1000);
		char *str = value_to_c_string(ctx, args[0]);
		fprintf(stderr, "%s", buf);
		fprintf(stderr, "%s", str);
		fflush(stderr);
		free(str);
	}
	return JSValueMakeNull(ctx);