Since we're building shared libraries now, let's not reinvent the wheel.
This also makes packaging libbtrfs much easier. The following (empty) files
are added to satisfy autoconf: AUTHORS ChangeLog NEWS INSTALL.

Changes by Mark Fasheh:
- Fixes to make this patch work with upstream
- I moved the previous contents of INSTALL to README since that seems
  to make more sense now)

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.de>