we use per-target kernel versions for 2.6 for a long time now

SVN-Revision: 19577

include/kernel-version.mk

@@ -2,8 +2,6 @@
 
 ifeq ($(KERNEL),2.4)
   LINUX_VERSION?=2.4.37.5
-else
-  LINUX_VERSION?=2.6.21.7
 endif
 LINUX_RELEASE?=1