[Bug 282322] graphics/mesa-devel: fix build with clang 19 and correct TLS model

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282322

            Bug ID: 282322
           Summary: graphics/mesa-devel: fix build with clang 19 and
                    correct TLS model
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jbeich@FreeBSD.org
          Reporter: jkim@FreeBSD.org
          Assignee: jbeich@FreeBSD.org
             Flags: maintainer-feedback?(jbeich@FreeBSD.org)

Created attachment 254513
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=254513&action=edit
Fix build with clang 19 and correct TLS model

When it is compiled with Clang 19, it fails to run with errors like this:

Unsupported relocation type 36 in non-PLT relocations

That's because Clang 19 now supports "-mtls-dialect=gnu2" but our rtld does not
support it.  In fact, we have been using "-ftls-model=initial-exec" instead.

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