Possible arguments: (none)
The port has files with line endings in DOS format which need to be converted. Several variables can be set to control which files will be converted. The default is to convert all files, including binaries. See Section 4.4.3, “Simple Automatic Replacements” for examples.
DOS2UNIX_REGEX: match file names
	  based on a regular expression.
DOS2UNIX_FILES: match literal file
	  names.
DOS2UNIX_GLOB: match file names based
	  on a glob pattern.
DOS2UNIX_WRKSRC: the directory from
	  which to start the conversions.  Defaults to
	  ${WRKSRC}.
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