sync libiberty from gcc

[Rainer Orth]

Hi Alan,

>> I'm about to sync over files from gcc master, and noticed there are a
>> few files that have commits in binutils master but not in gcc.  We
>> normally treat gcc as the master repository for files in libibery/
>> include/ and config/ that appear in both gcc and binutils.  That means
>> these commits might disappear if someone syncs over the files without
>> checking first.
> [...]
>> config/largefile.m4
>> commit c8693053f895626ae90b7856d3738de47d14d52c
>> Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
>>
>> Please arrange to have your commits applied to the gcc repo.
>
> thanks for the reminder: I'd completely forgotten about this.
> Unfortunately, gcc's new ChangeLog generation from the commit message
> blocks installing the patch:
>
> 	https://gcc.gnu.org/pipermail/gcc-patches/2020-September/553403.html

since Martin seems to be away, I've commited the sync with a reduced
ChangeLog entry and later fixed that up manually.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University