linux-jlime-ben-nanonote: fix GCC-4.6 build errors

The following changes fix build errors occuring on linux kernel 2.6.36
for the ben-nanonote machine:
- add LIC_FILES_CHKSUM,
- add "fix-gcc-4.6.0-build-errors.patch" patch file to fix an issue
  where gcc errors on 'unused but set variables' in kernel code. Issue
  fixed as in upstream mainline kernel in changesets #f1b6a505,
  #c726b822, #7a6e4ca1, #91b51f30, #71271aab and #d3ce0e98.

Signed-off-by: Apelete Seketeli <apelete@seketeli.net>