[Patch,committed] Re-generate libgomp's Makefile.in with automake 1.15.1

[Tobias Burnus]

libgomp's Makefile.in were last re-generated by automake 1.16.1;
result: --enable-maintainer-mode now tries to find and use
  automake-16
when generating that file.

Committed as obvious in commit r11-3613-g2fe5a545e09edb4001bbfb74c571c806ebc7cb25

Tobias

commit 2fe5a545e09edb4001bbfb74c571c806ebc7cb25
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Fri Oct 2 12:07:57 2020 +0200

     libgomp: Regenerate configure files with automake 1.15.1

     libgomp/ChangeLog:
             * Makefile.in: Regenerate with automake 1.15.1.
             * aclocal.m4: Likewise.
             * configure: Likewise.
             * testsuite/Makefile.in: Likewise.


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