Use common symbols to avoid dragging in getopt.o unless a getopt-using

command is linked in.

src/core/exec.c

@@ -36,6 +36,10 @@
 static struct command commands[0] __table_start ( commands );
 static struct command commands_end[0] __table_end ( commands );
 
+/* Avoid dragging in getopt.o unless a command really uses it */
+int optind;
+int nextchar;
+
 /**
  * Execute command
  *