cli: Manually patch the generated code to fix compiler warning

cmdline.c: In function ‘cmdline_parser_internal’:
cmdline.c:588:7: warning: variable ‘check_required’ set but not used [-Wunused-but-set-variable]
   int check_required;
       ^
diff --git a/ggsn/cmdline.c b/ggsn/cmdline.c
index b06f661..a84e7e8 100644
--- a/ggsn/cmdline.c
+++ b/ggsn/cmdline.c
@@ -585,14 +585,12 @@
   
   int override;
   int initialize;
-  int check_required;
   int check_ambiguity;
   
   package_name = argv[0];
   
   override = params->override;
   initialize = params->initialize;
-  check_required = params->check_required;
   check_ambiguity = params->check_ambiguity;
 
   if (initialize)