remove dregs from from bio.h

Reference: /n/atom/patch/applied/biodregs
Date: Thu May 22 22:52:53 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/include/bio.h	Thu May 22 22:52:53 2014
+++ /sys/include/bio.h	Thu May 22 22:52:53 2014
@@ -40,13 +40,6 @@
 	uchar	b[Bungetsize+Bsize];
 };
 
-/* Dregs, redefined as functions for backwards compatibility */
-#define	BGETC(bp)	Bgetc(bp)
-#define	BPUTC(bp,c)	Bputc(bp,c)
-#define	BOFFSET(bp)	Boffset(bp)
-#define	BLINELEN(bp)	Blinelen(bp)
-#define	BFILDES(bp)	Bfildes(bp)
-
 int	Bbuffered(Biobufhdr*);
 int	Bfildes(Biobufhdr*);
 int	Bflush(Biobufhdr*);