Add psl to libcurl linkage in external_libcurl.cmake

[sebastianserna30]

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This PR fixes a build error in the librealsense project when compiling with CHECK_FOR_UPDATES=ON. As mentioned in #13724 . The issue arises during the linking phase of the realsense-viewer executable due to missing symbols from the Public Suffix List (PSL) library, which are required by the statically built libcurl library.

When CHECK_FOR_UPDATES is enabled, the build process fetches and builds libcurl as a static library. However, the linkage step fails because libcurl depends on libpsl (for PSL functionality), and the psl library was not explicitly linked in the CMake configuration. This results in undefined reference errors for PSL functions like psl_free, psl_latest, psl_builtin, and psl_is_cookie_domain_acceptable.

[sysrsbuild]

Can one of the admins verify this patch?

[Nir-Az]

@sebastianserna30 Hi Thanks for your PR I wonder if PSL is actually needed in our use case with curl. Maybe we can consider turning it off in the curl cmake?

this addition cause a regression in our GHA flows Especially in Ubuntu 24 and windows

[Nir-Az]

Hi @sebastianserna30 , any progress with this PR?

[Nir-Az]

Thanks for the PR, since #14315 was merged the new dependency is no longer required. Closing this PR