nothing uses these, remove

Index: sys/sys/mbuf.h
===================================================================
RCS file: /cvs/src/sys/sys/mbuf.h,v
diff -u -p -r1.264 mbuf.h
--- sys/sys/mbuf.h	29 Aug 2024 10:44:40 -0000	1.264
+++ sys/sys/mbuf.h	5 Nov 2024 08:59:40 -0000
@@ -58,12 +58,10 @@
 
 #define	MAXMCLBYTES	(64 * 1024)		/* largest cluster from the stack */
 #define	MINCLSIZE	(MHLEN + MLEN + 1)	/* smallest amount to put in cluster */
-#define	M_MAXCOMPRESS	(MHLEN / 2)		/* max amount to copy for compression */
 
 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
 					/* 2K cluster can hold Ether frame */
 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
-#define	MCLOFSET	(MCLBYTES - 1)
 
 /* Packet tags structure */
 struct m_tag {
Index: share/man/man9/mbuf.9
===================================================================
RCS file: /cvs/src/share/man/man9/mbuf.9,v
diff -u -p -r1.126 mbuf.9
--- share/man/man9/mbuf.9	9 Jul 2024 18:56:54 -0000	1.126
+++ share/man/man9/mbuf.9	5 Nov 2024 08:59:40 -0000
@@ -145,12 +145,10 @@
 
 #define MAXMCLBYTES     (64 * 1024)
 #define MINCLSIZE       (MHLEN + MLEN + 1)
-#define M_MAXCOMPRESS   (MHLEN / 2)
 
 #define MCLSHIFT        11
 
 #define MCLBYTES        (1 << MCLSHIFT)
-#define MCLOFSET        (MCLBYTES - 1)
 
 #define mtod(m,t)       ((t)((m)->m_data))