Preparation phase: prepare.tex not needed to finish preparation

Until now, the final preparation target of the preparation phase depended
on all the `$(makesrc)' files. This caused a problem because we were
telling it to also depend on `prepare.tex' (which is the same file that is
being built).

With this commit, we are applying the same solution we have already done in
`paper.mk' (for `paper.tex'): we are removing `prepare' from the list of
prerequisites.

This bug was found by Zahra Sharbaf.

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