Committed: Do not report a weak need for a DT_NEEDED DSO

[Nick Clifton]

Hi Guys,

  A user recently reported that the linker's -no-copy-dt-needed option
  could trigger error messages for DSO that are "needed" to satisfy weak
  references.  This is obviously wrong and so I am applying the patch
  below to fix the problem.  The patch also improves the error reporting
  for non-weak references that really do need a DSO, so that the correct
  input file name is used.

Cheers
  Nick

bfd/ChangeLog
2010-01-21  Nick Clifton  <nickc@redhat.com>

	* elflink.c (elf_link_add_object_symbols): Look up name of
	undefined symbol both before and after versioning has been
	applied.  Do not bother with symbols that are weakly undefined.

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