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aux/realemu: remove unused global

--- a/sys/src/cmd/aux/realemu/xec.c

+++ b/sys/src/cmd/aux/realemu/xec.c

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

 #define sign(s)	(1UL<<((s)-1))

 #define mask(s) (sign(s)|(sign(s)-1))

-int cputrace;

-

 static void

 push(Iarg *sp, Iarg *a)

 {