tree: upgrade 2.0.2 -> 2.0.4

Changelog:
2.0.4:
- Fix missing comma in JSON output.

2.0.3:
- Fix segfault when filelimit is used and tree encounters a directory it
  cannot enter.
- Use += when assigning CFLAGS and LDFLAGS in the Makefile allowing
  them to be modified by environment variables during make. (Ben Brown)
  Possibly assumes GNU make.
- Fixed broken -x option (stops recursing.)
- Fix use after free (causing segfault) for dir/subdir in list.c
- Fixes for .gitignore functionality
  - Fixed * handing in patmatch. Worked almost like ** before, now properly
    stops at /'s.  These issues were the result of forgetting that patmatch()
    was just to match filenames to patterns, not paths.
  - Patterns starting with / are actually relative to the .gitignore file,
    not the root of the filesystem, go figure.
  - Patterns without /'s in .gitignore apply to any file in any directory
    under the .gitignore, not just the .gitignore directory
- Remove "All rights reserved" from copyright statements.  A left-over from
  trees original artistic license.
- Add in --du and --prune to --help output
- Fixed segfault when an unknown directory is given with -X
- Fixed output up for -X and -J options.
- Remove one reference to strnlen which isn't necessary since it may not
  be available on some OS's.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

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