Add checker.sh, which will check the versions for each of the tools required to build E17, and abort if any aren't found.
Add checker.sh, which will check the versions for each of the tools required
to build E17, and abort if any aren't found.

I haven't hooked this into autogen.sh yet, because there's still work to be
done. It should really check which version and abort if they're not correct.

I actually wrote this a bit ago, when we were fielding a lot of version-based
questions, but forgot. ;)


SVN revision: 6121

rvandegrift/e,FlorentRevest/Enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tasn/enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,tasn/enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment