fixes for using system packages

[christian-rauch]

I was building Open3D with most system packages enabled and some features deactivated. This uncovered a couple of compilation and linking issues, such as:

1. usingExtractZIP when WITH_MINIZIP is off
2. using GLFW APIs that are only available from version 3.4 onwards
3. linking OpenSSL when it has not been found before when USE_SYSTEM_CURL and USE_SYSTEM_OPENSSL are set

Type

• Bug fix (non-breaking change which fixes an issue): Fixes #
• New feature (non-breaking change which adds functionality). Resolves #
• Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

Fixing the build

Checklist:

• I have run python util/check_style.py --apply to apply Open3D code style
  to my code.
• This PR changes Open3D behavior or adds new functionality.
  • Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is
    updated accordingly.
  • I have added or updated C++ and / or Python unit tests OR included test
    results (e.g. screenshots or numbers) here.
• I will follow up and update the code if CI fails.
• For fork PRs, I have selected Allow edits from maintainers.

Description

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.

[ssheorey]

Thanks @christian-rauch for these fixes! Please see one comment below.

[ssheorey]

Hi @christian-rauch we need SSL as an indirect dependency of cURL. So with USE_SYSTEM_CURL, we do not expliclty need to find and link system SSL. Can you update this so that SSL is ignored with USE_SYSTEM_CURL?

[christian-rauch]

But isn't this exactly what the commit is fixing? Previously, with USE_SYSTEM_CURL set to ON, we would not link SSL. Hence, the linking issues. So with USE_SYSTEM_CURL=ON, we still need to link SSL explicitly.

[christian-rauch]

Btw, python util/check_style.py --apply requires an old clang-format version. Also with the oldest possible setting required_clang_format_major = 14 on Ubuntu 24.04, this failed in the regex. Ubuntu returns something like Ubuntu clang-format version 18.1.3 (1ubuntu1), i.e. it prepends Ubuntu to the string.