Move uniq() prototype into extern.h.

usr.sbin/services_mkdb/extern.h

@@ -30,3 +30,5 @@
  */
 
 extern const HASHINFO hinfo;
+
+void uniq(const char *);

usr.sbin/services_mkdb/services_mkdb.c

@@ -56,8 +56,6 @@ static char tname[MAXPATHLEN];
 #define	PMASK		0xffff
 #define PROTOMAX	5
 
-extern void	uniq(const char *);
-
 static void	add(DB *, StringList *, size_t, const char *, size_t *, int);
 static StringList ***parseservices(const char *, StringList *);
 static void	cleanup(void);

usr.sbin/services_mkdb/uniq.c

@@ -42,7 +42,6 @@ __FBSDID("$FreeBSD$");
 
 #include "extern.h"
 
-void uniq(const char *);
 static int comp(const char *, char **, size_t *);
 
 /*