[metapost] verbatimtex... etex after mpost 1.210

[Taco Hoekwater]

> After thinking about it, I would suggest instead that the whitespace *on 
> the same line* of *every* occurrence of verbatimtex be removed, up to 
> the first new-line (included) or to the first non-space character (not 
> included). This should be easier to implement (no need to keep track of 
> the first verbatimtex) and it treats every verbatimtex-etex block in a 
> consistent way. What do you think? Can we expect to see this fix in the 
> next release?

Assuming there is agreement. It makes sense to me, but ...