libraw1394 v2.0.9 release

- Fix that raw1394_iso_recv_flush() did not have any effect when running
  on firewire-core alias juju kernel drivers.  Requires kernel 3.4 or
  later.
- Remove build-time dependency on linux-headers.  Before, if too old
  kernel headers were present on the build system, features and fixes
  would be silently omitted from the build.
- Remove --with-fw-dir configure switch which is no longer useful.
- Janitorial fixes.
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