Backport some gcc9 fixes to branch

[Kornel Benko]

Am Fri, 25 Oct 2019 23:01:30 -0400
schrieb Richard Kimberly Heck <rikiheck at lyx.org>:

> On 10/25/19 1:13 PM, Jean-Marc Lasgouttes wrote:
> > Riki, is this OK?
> >
> > If this goes in, Kornel will probably have to backport some of his
> > own patches.  

Should be doable :)

> I know nothing about such things. If you think it's a good idea,
> please go ahead.
> 
> Riki
> 

	Kornel

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