Fix syntax error in parse_path after r316952.

Also fix bad whitespace in sort_unique after r314809.

The parse_path syntax error came up in DIRDEPS_BUILD as the following
and emptied out all Makefile.depend files due to it:

1. python share/mk/meta2deps.py

	  File "share/mk/meta2deps.py", line 538
	    rdir = os.path.realpath(dir)
	    ^

IndentationError: unexpected indent

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