Link error when compiling with -fsanitize=undefined

[Kornel Benko]

Am Sat, 18 Sep 2021 10:34:49 -0400
schrieb Scott Kostyshak <skostysh at lyx.org>:

> > I tried but failed. The problem is that tex2lyx uses
> > libzlibstatic.a, ../../lib/libsupport.a to link with, but these are compiled with
> > -fsanitize. So the only way is to define dummy versions as Jean-Marc pointed out.  
> 
> Thank you for trying, Kornel!
> 
> Scott
> 

Actually it was pretty easy. According to the error message,
	undefined reference to `typeinfo for lyx::xml::FontTag'
looked wrong, since it is defined in xml.h. But  src/tex2lyx/dummy_impl.cpp used
FontTag _and_ did not include it xml.h.

So inserting this include cured the compilation for me.

	Kornel
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