camlp4: 4.02.0+1 -> 4.02+6
* Remove unneeded substitution in postConfigure
This was fixed here: https://github.com/ocaml/camlp4/commit/81ed5cf2e857c08e433d891328767ad7f07f1447
* camlp4: use fetchzip
It is considered more reliable than fetchurl
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