Typos and fixes for init_c.c to not include stuff we don't have

lib/kadm5/init_c.c

@@ -33,9 +33,15 @@
 
 #include "kadm5_locl.h"
 #include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
 #include <netdb.h>
+#endif
 
 RCSID("$Id$");