[LyX/master] Fix compilation of included libiconv with autoconf

[Kornel Benko]

Am Thu, 19 Nov 2020 13:14:35 +0100 (CET)
schrieb Jean-Marc Lasgouttes <lasgouttes at lyx.org>:

> commit b5d1f2f3002c22db64fda4eb40220a1dc0b43903
> Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
> Date:   Thu Nov 19 13:40:26 2020 +0100
> 
>     Fix compilation of included libiconv with autoconf
> ---
>  3rdparty/libiconv/Makefile.am |    2 +-
>  config/lyxinclude.m4          |    3 +++
>  2 files changed, 4 insertions(+), 1 deletions(-)

Thanks Jean-Marc. Compiles fine now. And shows the same (wrong?) behaviour as
the cmake-compilation.

Example:
 in lyx open autotests/export/latex/unicodesymbols/009-cyrillic.lyx
 Select Document->Settings...->Language->Encoding->Custom->Nordic languages (CP 865)
 View pdf

With internal iconv we get error, with external iconv it is OK.
Unsure, if we really should do nothing here.

	Kornel
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