[metapost] reverse clip operation

[Taco Hoekwater]

Andreas Matthias wrote:
>>Almost there:
>>
>>  clip_p := (-99u,-99u) -- (99u,-99u) -- (99u,99u) -- (-99u,99u)
>>     -- p  --(-99u,99u)  -- cycle;
> 
> Hmm... For me this yields the same result. I am confused. Did I
> mess up something?

Worked for me (but I am running the svn HEAD version)

Taco