Generated packages lack most of the required legal notices

[Blzut3]

Original report by Jason Yundt (Bitbucket: [Jason Yundt](https://bitbucket.org/Jason Yundt), ).

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Steps to reproduce:

cd wolfstoneextract
mkdir build
cd build
cmake ..
make package

On my system this generates an archive named wolfstoneextract-1.2-linux-x86_64.tar.xz. That archive contains a copy of GPLv3, but it lacks some other legal notices:

• vendor/libogg/COPYING

• vendor/libvorbis/COPYING

• vendor/ww2ogg/COPYING

• The BSD 3 clause license and associated copyright notices in:

  • src/doomerrors.h
  • src/file_idcl.cpp
  • src/files.cpp
  • src/filesys.cpp
  • src/filesys.h
  • src/filesys_steam.cpp
  • src/resourcefile.cpp
  • src/soundbank.cpp
  • src/soundbank.h
  • src/tarray.h
  • src/zip.cpp
  • src/zip.h
  • src/zstring.cpp
  • src/zstring.h
  • src/scanner.cpp
  • src/scanner.h

• The MIT license and associated copyright notices in:

  • src/mz_crc32.cpp
  • src/mz_crc32.h

• The ISC license and associated copyright notice in vendor/revorb/revorb.cpp.

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