[LyX/master] Update lyx-build script

[Pavel Sanda]

On Sun, Oct 25, 2020 at 03:55:26AM +0100, Richard Kimberly Heck wrote:
> diff --git a/development/tools/lyx-build b/development/tools/lyx-build
> index 853f0b9..1c61b2f 100755
> --- a/development/tools/lyx-build
> +++ b/development/tools/lyx-build
> @@ -81,7 +82,7 @@ $DEBUG cd "$BASE/lyx-build/";
>  
>  echo "Building distribution...";
>  $DEBUG "$BASE/lyx-export/configure" --enable-build-type=rel --enable-qt5

I think --enable-qt5 is default now and does not need to passed... P