Moved all system-dependent #include's containing endianity conversion

functions to sysdep header endian.h.

sysdep/unix/Modules

@@ -3,6 +3,7 @@ main.c
 timer.h
 io.c
 unix.h
+endian.h
 
 krt.c
 krt.h

sysdep/unix/endian.h

@@ -0,0 +1,17 @@
+/*
+ *	BIRD -- Endianity Conversion
+ *
+ *	(c) 1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_ENDIAN_H_
+#define _BIRD_ENDIAN_H_
+
+/* hton[sl] and ntoh[sl] are defined here */
+
+#include <sys/types.h>
+#include <netinet/in.h>
+
+#endif