devel/freebsd-gcc9: Bump to 9.5.0.

[jhb]

Summary

While here, switch the default ABI for powerpc64 to ELFv2.

[lwhsu]

devel/freebsd-gcc9/Makefile

51

Just being curious why disable zstd while we have that in base.

[jhb]

devel/freebsd-gcc9/Makefile

51

This matches a commit made to lang/gcc9 (and in other GCC ports).

commit 8397eda9d22a3b36d66a48acfbc69577af55bebe
Author: Gerald Pfeifer <[e-mail]>
Date: Wed Mar 3 21:43:02 2021 +0000

Back port part of r566296 | gerald | 2021-02-22 from lang/gcc9-devel:

  [B]ack port of part of r565301 | gerald | 2021-02-15 from
  lang/gcc11-devel:

    Explicitly build --without-zstd such that archivers/zstd isn't pulled
    in inadvertedly when present in the build system even though it is not
    an explicit dependency. [1]

[jhb]

Any further thoughts @lwhsu ?

[lwhsu]

In D35684#818236, @jhb wrote:

Any further thoughts @lwhsu ?

I think it's fine as for aligning with ports.

For ports I would suggest have an OPTION as it seems used by LTO related things?