Relocate CMake target export definitions

[donny-dont]

When exporting a CMake target the install(TARGETS ${ZLIB_INSTALL_LIBRARIES}) is repeated with an EXPORT parameter. On Windows this would install the .dll files into the lib directory.

Set the EXPORT_NAME earlier and unconditionally on the TARGET. Then move the EXPORT to a single install(TARGETS).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e2c4179) 83.15% compared to head (a591ba5) 83.14%.
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1657      +/-   ##
===========================================
- Coverage    83.15%   83.14%   -0.01%     
===========================================
  Files          135      135              
  Lines        10898    10898              
  Branches      2817     2817              
===========================================
- Hits          9062     9061       -1     
  Misses        1127     1127              
- Partials       709      710       +1     

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[mtl1979]

Before:

C:\build\git\zlib-ng\build-win>cmake --install .
-- Install configuration: "Release"
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlib-ng.lib
-- Up-to-date: install/Program Files (x86)/zlib/bin/zlib-ng2.dll
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlibstatic-ng.lib
-- Installing: install/Program Files (x86)/zlib/include/zlib-ng.h
-- Up-to-date: install/Program Files (x86)/zlib/include/zlib_name_mangling-ng.h
-- Up-to-date: install/Program Files (x86)/zlib/include/zconf-ng.h
-- Installing: install/Program Files (x86)/zlib/lib/pkgconfig/zlib-ng.pc
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlib-ng.lib
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlib-ng2.dll
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlibstatic-ng.lib
-- Installing: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng.cmake
-- Up-to-date: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-release.cmake
-- Installing: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-config.cmake
-- Installing: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-config-version.cmake

After:

C:\build\git\zlib-ng\build-win>cmake --install .
-- Install configuration: "Release"
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlib-ng.lib
-- Up-to-date: install/Program Files (x86)/zlib/bin/zlib-ng2.dll
-- Up-to-date: install/Program Files (x86)/zlib/lib/zlibstatic-ng.lib
-- Up-to-date: install/Program Files (x86)/zlib/include/zlib-ng.h
-- Up-to-date: install/Program Files (x86)/zlib/include/zlib_name_mangling-ng.h
-- Up-to-date: install/Program Files (x86)/zlib/include/zconf-ng.h
-- Up-to-date: install/Program Files (x86)/zlib/lib/pkgconfig/zlib-ng.pc
-- Up-to-date: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng.cmake
-- Installing: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-release.cmake
-- Up-to-date: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-config.cmake
-- Up-to-date: install/Program Files (x86)/zlib/lib/cmake/zlib-ng/zlib-ng-config-version.cmake

[mtl1979]

Removes some duplicate files during install step. LGTM