kernel/hz.bc: ignore.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/.gitignore

@@ -4,3 +4,4 @@
 config_data.h
 config_data.gz
 timeconst.h
+hz.bc