add md5 sum of the 2.6.23.11 tarball

SVN-Revision: 9799

include/kernel-version.mk

@@ -25,6 +25,9 @@ endif
 ifeq ($(LINUX_VERSION),2.6.23.9)
   LINUX_KERNEL_MD5SUM:=fc341e4f23bcd4056bdb0c9edc24ea3d
 endif
+ifeq ($(LINUX_VERSION),2.6.23.11)
+  LINUX_KERNEL_MD5SUM:=b9e18a02297ee556cac26d65f25e0ccf
+endif
 
 # disable the md5sum check for unknown kernel versions
 LINUX_KERNEL_MD5SUM?=x