Makefile: Drop KERNELVERSION

KERNELVERSION is unused since commit 4b89e48a1039f ("Delete the
decode-xeon script...").

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
diff --git a/Makefile b/Makefile
index e784921..5ac8a59 100644
--- a/Makefile
+++ b/Makefile
@@ -50,8 +50,6 @@
 endif
 endif
 
-KERNELVERSION	:= $(shell uname -r)
-
 .PHONY: all strip clean install uninstall
 
 all: