How to solve "zlib multiple defined symbol" error, with open3d v0.16.0 and VS2019?

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

Dear open3d developer

When I build open3d v0.16.0 and VS2019, I got zlib multiple defined symbol issue, see below. How to solve it?

Thank you!

`
Severity Code Description Project File Line Suppression State
Error MSB8066 Custom build for 'D:\git\open3d_0.15\build_0.16\CMakeFiles\5ef9c6b1004a79529d8b433530887f53\ext_zlib-build.rule;D:\git\open3d_0.15\build_0.16\CMakeFiles\5ef9c6b1004a79529d8b433530887f53\ext_zlib-install.rule;D:\git\open3d_0.15\build_0.16\CMakeFiles\0dcc2ef3167d87326574770afabe7d39\ext_zlib-complete.rule;D:\git\open3d_0.15\build_0.16\CMakeFiles\120eb681c97351abe762cc432ece25cf\ext_zlib.rule' exited with code 1. ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppCommon.targets 241
Error LNK2005 get_crc_table already defined in crc32.obj [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib.lib(zlib1.dll) 1
Error LNK2005 inflateInit2_ already defined in inflate.obj [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib.lib(zlib1.dll) 1
Error LNK2005 inflateEnd already defined in inflate.obj [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib.lib(zlib1.dll) 1
Error LNK2005 inflate already defined in inflate.obj [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib.lib(zlib1.dll) 1
Error LNK1169 one or more multiply defined symbols found [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\Release\zlib.dll 1
Error LNK2005 crc32 already defined in crc32.obj [D:\git\open3d_0.15\build_0.16\zlib\src\ext_zlib-build\zlib.vcxproj] ext_zlib (ExternalProjectTargets\ext_zlib\ext_zlib) D:\git\open3d_0.15\build_0.16\zlib.lib(zlib1.dll) 1

`