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loadpath is now reset to default when using why3config --detect

This commit also marks the dependency on ocamlfind as being build-only.

Some people dump the content of tarballs into git repositories and thus
experience compilation failures. Indeed, some directories from the tarball
are empty and thus not preserved by git. So this commit creates these
directories on the fly.

As for plugins/printer, it has to be handled differently, since it is
needed by ocamldep and thus cannot be created on the fly. So its .keepme
file is put in the tarball to keep it nonempty.

(cherry picked from commit 869175b9e3d2fbf63b6a0a38456c542e8bc7bc20)

share/Makefile.config is created even if enable_relocation
with the relevant info only

This allows why3doc to generate anchors for operator definitions,
including "(*)".

That way, unrecognized versions of Alt-Ergo (e.g. 2.0) are no longer
associated to obsolete versions, by default.

It is needed for compiling the Coq tactic Why3.vo file when native
compilation is disabled.

This commit also avoid a potential race condition when Why3.vo was
compiled with both the native and bytecode compilers.