[Bug 224514] devel/libtool: pass through -fuse-ld flags

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224514

            Bug ID: 224514
           Summary: devel/libtool: pass through -fuse-ld flags
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: tijl at FreeBSD.org
          Reporter: emaste at freebsd.org
             Flags: maintainer-feedback?(tijl at FreeBSD.org)
          Assignee: tijl at FreeBSD.org

Created attachment 189026
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=189026&action=edit
patch to add -fuse-ld= to passed through options

Some ports depend on permissive or broken behaviour from the GNU BFD linker,
ld.bfd. Clang and GCC support a -fuse-ld= flag to specify the linker to use,
and as we migrate to installing lld as the base system's /usr/bin/ld we'll want
to make use of -fuse-ld=bfd to let ports that fail with lld use bfd instead.

An upstream libtool change from Feb 2016 supports passing through -fuse-ld=,
but it has not yet made it into a release:
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=f9970d99293faf908fdc153a653fa5781095fb7a

This is an equivalent change for our libtool port.

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