[Bug 258536] Add global LTO support for ports

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258536

            Bug ID: 258536
           Summary: Add global LTO support for ports
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr@FreeBSD.org
          Reporter: pkubaj@FreeBSD.org
                CC: ports-bugs@FreeBSD.org

Created attachment 227939
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=227939&action=edit
patch

It's well known that LTO provides both performance and size benefits for
binaries.

Add preliminary, opt-in support for global LTO enforcement to ports. Ports that
provide LTO option on their own and the ones that don't work with LTO will need
to set LTO_UNSAFE in the future.

When the LTO is switched by default, it will need to be excluded on the
platforms where LTO does not work, but the purpose of the patch is to give
opt-in support.

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