Prints a six-digit string including the GCC patchlevel.  Also fix
the 'usage' comment for cc-version.
Signed-off-by: NSegher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!