Don't build getopt at all if it's not needed.

libs/port/getopt.c

diff --git a/libs/port/getopt.c b/libs/port/getopt.c
index cfc1a8f..949389a 100644
--- a/libs/port/getopt.c
+++ b/libs/port/getopt.c
@@ -33,6 +33,10 @@
 # include <config.h>
 #endif
 
+#ifdef HAVE_GETOPT_LONG
+#define ELIDE_CODE
+#endif
+
 #if !defined __STDC__ || !__STDC__
 /* This is a separate conditional since some stdc systems
    reject `defined (const)'.  */

libs/port/getopt1.c

diff --git a/libs/port/getopt1.c b/libs/port/getopt1.c
index 5a629ef..be4b1d1 100644
--- a/libs/port/getopt1.c
+++ b/libs/port/getopt1.c
@@ -24,6 +24,10 @@
 #include <config.h>
 #endif
 
+#ifdef HAVE_GETOPT_LONG
+#define ELIDE_CODE
+#endif
+
 #ifdef _LIBC
 # include <getopt.h>
 #else