py-xattr: updated to 0.9.6

Version 0.9.6:
* Fix release build by including *.[ch] in Manifest.in

Version 0.9.4:
* Extract inline C code for syntax highlighting and easier maintenance
* Fix Travis build
* Always include sys/types.h (musl compatibility)

Version 0.9.3:
* Do not attempt to use surrogateescape unless it is available

Version 0.9.2:
* Fix BSD issue w/ lsattr and long attrs
* Remove unreachable code

Version 0.9.1:
* Allow (Python 2) long for fd
* Fix Python 3 bytes handling in xattr.tool
* Use cffi 1.X features to build native module for faster import
  https://github.com/xattr/xattr/pull/47
* NOTE: Version 0.9.0 is the same, was momentarily uploaded with
  incomplete CHANGES.txt

Version 0.8.0:
* Use os.fsencode where available to better handle filesystem quirks related
  to surrogates
* Options bugfix and compatibility module for pyxattr API

Version 0.7.9:
* Added xattr/tests/*.py to MANIFEST.in

Version 0.7.8:
* Added MANIFEST.in to ensure that the .txt files are included

Version 0.7.7:
* Fixed FreeBSD build

(adam)