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mk: dead code removal

--- a/sys/src/cmd/mk/main.c

+++ b/sys/src/cmd/mk/main.c

@@ -2,7 +2,6 @@

 #define		MKFILE		"mkfile"

-static char *version = "@(#)mk general release 4 (plan 9)";

 int debug;

 Rule *rules, *metarules;

 int nflag = 0;

--- a/sys/src/cmd/mk/shprint.c

+++ b/sys/src/cmd/mk/shprint.c

@@ -1,8 +1,6 @@

 #include	"mk.h"

 static char *vexpand(char*, Envy*, Bufblock*);

-static char *shquote(char*, Rune, Bufblock*);

-static char *shbquote(char*, Bufblock*);

 void

 shprint(char *s, Envy *env, Bufblock *buf)