[Bug 246322] ld.bfd error on releng/11.4 confuses many autoconf scripts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246322

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Mon May 11 19:36:39 UTC 2020
New revision: 360915
URL: https://svnweb.freebsd.org/changeset/base/360915

Log:
  Use -fno-asynchronous-unwind-tables to compile lib/csu

  Summary:
  In r209294 kib added -fno-asynchronous-unwind-tables to the compile
  flags for the GNU C startup components. This was done to work around a
  BFD ld assertion, "no .eh_frame_hdr table will be created", which is
  produced because of the layout of the startup objects.

  Add the same flag to lib/csu too, for the same reason. And similarly to
  r209294, also add -fno-omit-frame-pointer.

  This is primarily meant to quickly MFC to stable/11, so it can end up in
  the 11.4 release, as a fix for https://bugs.freebsd.org/246322.

  PR:           246322
  MFC after:    3 days
  Differential Revision: https://reviews.freebsd.org/D24797

Changes:
  head/lib/csu/Makefile.inc

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