Removed "chan" from dict list since it causes file(1) to misclassify threaded C programs as Alef programs.

Reference: /n/sources/patch/applied/file-notalef
Date: Wed Nov  1 18:59:26 CET 2006
Signed-off-by: JoelCSalomon@Gmail.com

--- /sys/src/cmd/file.c	Wed Nov  1 18:38:32 2006
+++ /sys/src/cmd/file.c	Wed Nov  1 18:38:32 2006
@@ -47,7 +47,6 @@
 	"alef",		Alword,
 	"array",	Lword,
 	"block",	Fword,
-	"chan",		Alword,
 	"char",		Cword,
 	"common",	Fword,
 	"con",		Lword,