[RFC - Gold Patch] Implement INCLUDE directive

[Sterling Augustine]

Hi,

Enclosed please find a first pass at implementing the INCLUDE
directive, bringing Gold to parity with ld.bfd, at least regarding
this feature.

A lot of setup isn't quite done when script_include_directive is
called, so the note in the old FIXME is quite right--using a standard
dirsearch structure in read_script_file is hard for reasons similar to
the need to create a fake Task there.

I wasn't sure about the best place to put the more primitive directory
search logic needed here, so I included it as a static member of
Dirsearch. Is there a better place?

Sterling

011-11-16  Sterling Augustine  <saugustine@google.com>

	* script.cc (script_include_directive): Implement.
	(read_script_file): New local variables name and search_path. Update
	comment. Call IS_ABSOLUTE_PATH and Dirsearch::find_file_in_dir_list.
	* dirsearch.h (Dirsearch::find_file_in_dir_list): Declare new method.
	* dirsearch.cc (Dirsearch::find_file_in_dir_list): Implement it.
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