libtool-2.4.6 needs to be rebuilt for gcc-10

[Lemures Lemniscati]

Hi!

libtool needs to be rebuilt for gcc-10,
since libtool-2.4.6-7 (current) is built for gcc-7.4.0.

I tried to rebuild it, but some tests failed on an x86_64 build.


--
Here attached a set of files, which might be a candidate for cygport.
It is also placed at a personal playground [2] forked from [1].

A local build from it is placed at [3].

Release number is set to '9', because it is '8' at a current master
branch (commit 3486306) in the cygwin-packages repository of libtool [1]. 

[1]: https://www.cygwin.com/git/?p=git/cygwin-packages/libtool.git
[2]: https://github.com/cygwin-lem/libtool-cygport/tree/n_2.4.6-9
[3]: https://github.com/cygwin-lem/libtool-cygport/tree/n_2.4.6-9_gh-pages
     or https://cygwin-lem.github.io/libtool-cygport/index.html

--
But in cygport test, an x86_64 build brings unexpected failures as in

  https://ci.appveyor.com/project/cygwin/scallywag/builds/39372313/job/qjaaymd2s4ts9dly#L717

> Linking and loading.
>  27: link against a preloaded static library         ok
>  28: build and dynamically load a module             FAILED (demo.at:406)
>  29: preload static and dynamic module               FAILED (demo.at:423)
>  30: deplibs_check_method                            ok
>  31: disable fast install                            FAILED (demo.at:485)
>  32: force PIC objects                               FAILED (demo.at:501)
>  33: force non-PIC objects                           skipped (demo.at:535)
>  34: hardcoding library path                         FAILED (demo.at:612)
>  35: binary relinking at install time                FAILED (demo.at:720)
>  36: uninstalled libraries have priority             FAILED (demo.at:791)
>  37: linking with long file names                    FAILED (demo.at:978)
>  38: override pic_flag at configure time             ok
>  39: test --with-pic                                 skipped (with-pic.at:39)


Regards,

Lem
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