[metapost] Fix formatting glitches.

[Andreas Scherer]

Am 12.05.24 um 11:28 schrieb Andreas Scherer:
> Over the holiday I skimmed MP.PDF some more and created an extended set 
> of patches for MP.W from the TeX Live source tree. These address about 
> half of MP.PDF up to section '819. Conditional processing.'

And half a radio interview later, here are the "final" patches for MP.W.

Best,
Andreas

PS: Of course, the "final" version of MP.W still produces valid and 
compileable code.
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