cmCPackArchiveGenerator: Code cleanup

Source/CMakeLists.txt

Source/CPack/cmCPack7zGenerator.cxx

Source/CPack/cmCPack7zGenerator.h

Source/CPack/cmCPackArchiveGenerator.cxx

Source/CPack/cmCPackArchiveGenerator.h

Source/CPack/cmCPackCygwinBinaryGenerator.cxx

Source/CPack/cmCPackCygwinBinaryGenerator.h

Source/CPack/cmCPackCygwinSourceGenerator.cxx

Source/CPack/cmCPackCygwinSourceGenerator.h

Source/CPack/cmCPackFreeBSDGenerator.cxx

Source/CPack/cmCPackFreeBSDGenerator.h

Source/CPack/cmCPackGeneratorFactory.cxx

Source/CPack/cmCPackSTGZGenerator.cxx

Source/CPack/cmCPackSTGZGenerator.h

Source/CPack/cmCPackTGZGenerator.cxx

Source/CPack/cmCPackTGZGenerator.h

Source/CPack/cmCPackTXZGenerator.cxx

Source/CPack/cmCPackTXZGenerator.h

Source/CPack/cmCPackTarBZip2Generator.cxx

Source/CPack/cmCPackTarBZip2Generator.h