Fix a bug in opam file transformation for distrib #168
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Fixes #163
The code that adds the version to the opam file before building the distrib tarball was a bit lax and in some cases (like in #163) it would filter out lines that weren't actually the version field line.
This PR adds a few tests and strengthen that part of the code a bit.
The proper fix would probably be to use opam's libary for that but I think a quick fix will do for now. We won't need to do this anymore when integrating into dune!