[racket] raco setup and compile-collection-zos

From: Laurent (laurent.orseau at gmail.com)
Date: Sat Feb 16 12:27:17 EST 2013

Hi,

I tried `compile-collection-zos' as a programmatic equivalent to raco setup
on a given lib, but it seems there are some differences.

In particular, if PLTCOMPILEDROOTS is set, raco setup recompiles only the
specified lib, but `compile-collection-zos' tries to recompile all of
Racket.

For example, say I have a personal collection "a".

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