Fixing winedump

[Guy L. Albertelli]

The new winedump tool was seriously broken when attempting the "spec"
functions.

Also attempting to create the diffs from "cvs.winehq.com" I get message:
  cvs [server aborted]: no such directory 'tools/winedump'
It still generated the diff but why the error?

Changelog:
 Guy Albertelli  <<galberte at neo.lrun.com>>

  tools/winedump/pe.c, output.c, main.c
    - eliminate different segmentation faults.
    - when attempting to open a dll, append ".dll" to find it (was stripped
previously).
    - identify named exports so that the ordinal number is "@" in .spec
file.
    - setup output dll name prior to creating ordinal symbols.
    - don't overlay the named exports with the ordinal exports.
    - correct test for last symbol.
    - fix generated install script to match current make files.
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