Update llvm version detection for the 2.8 release.

The LLVM project recently released version 2.8, and updated
the SVN tree version to 2.9svn, obsoleting the simple check
for 'llvm-config --version' returning 2.8svn.

With this commit we instead check for the substrings 2.8 and 2.9
in the output of 'llvm-config --version', since we (currently)
support both the svn and released varieties of those versions.

A stable release also complicates our check for the ocaml bindings.
Previously we looked in `llvm-config --libdir`/ocaml which is
appropriate for local compiles, but distribution packagers are
likely to put the bindings in the default search path, e.g.
/usr/lib/ocaml/llvm. We now fall back to trying variations on
the standard library path returned by 'ocamlc -config' if we
don't find it under 'llvm-config --libdir'.

With this change, rust builds against LLVM 2.8 as packaged
in Ubuntu 10.10 as well as LLVM 2.9svn compiled locally.
(cherry picked from commit b606b65756f087c403180abd5418fe7dce469758)

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