add "analyze" target, LLVM static analyzing

I tested this on my OS X 10.7 macbook. Basically I
installed llvm from homebrew and included the static
analyzer. I did this some time ago so things might
have changed since then. Then I symlinked the
resulting scan-build and scan-view into my
/usr/local/bin. This makes me able to run
this target. At any rate I believe it might take
some working to get to a cross-user solution, but
the basics are there.