[tldoc] [tldev] no more \write18

[Karl Berry]

    Sorry, it is somehow late for me to commit and regenerate other
    files on svn.

As I wrote yesterday, I did it, for all languages except Chinese, and
the Chinese folks updated that.

    Also install-lnx-main.png should be changed, but I do not know
    who made that ("Allow execution of restricted list...." to remove).

I'll look into updating that, but it will hardly be a disaster if it is
left in.