avoid clash between for getopt's struct option

Since we don't use getopt_long() nothing outside the getopt()
implementation itself uses this structure, so move it into the
source to remove it from visibility and clashes with libc's

ok dtucker@

openbsd-compat/getopt.h

@@ -40,6 +40,7 @@
 #define required_argument  1
 #define optional_argument  2
 
+#if 0
 struct option {
 	/* name of long option */
 	const char *name;
@@ -58,6 +59,8 @@ int	 getopt_long(int, char * const *, const char *,
 	    const struct option *, int *);
 int	 getopt_long_only(int, char * const *, const char *,
 	    const struct option *, int *);
+#endif
+
 #ifndef _GETOPT_DEFINED_
 #define _GETOPT_DEFINED_
 int	 getopt(int, char * const *, const char *);

openbsd-compat/getopt_long.c

@@ -72,6 +72,20 @@
 
 #include "log.h"
 
+struct option {
+	/* name of long option */
+	const char *name;
+	/*
+	 * one of no_argument, required_argument, and optional_argument:
+	 * whether option takes an argument
+	 */
+	int has_arg;
+	/* if not NULL, set *flag to val when option found */
+	int *flag;
+	/* if flag not NULL, value to set *flag to; else return value */
+	int val;
+};
+
 int	opterr = 1;		/* if error message should be printed */
 int	optind = 1;		/* index into parent argv vector */
 int	optopt = '?';		/* character checked for validity */