rely on #include "getopt" to provide getopt's global variables

clients/lcdexec/lcdexec.c

@@ -46,9 +46,6 @@ char * help_text =
 
 char * progname = "lcdexec";
 
-extern char *optarg;
-extern int optind, optopt, opterr;
-
 /* Variables set by config */
 #define UNSET_INT -1
 #define UNSET_STR "\01"

server/main.c

@@ -51,10 +51,6 @@
 #endif
 /* TODO: fill in what to include otherwise */
 
-/* REVISIT: externs should be provided by a header */
-extern char *optarg;
-extern int optind, optopt, opterr;
-
 #include "shared/report.h"
 
 #include "drivers.h"