Previously, when confirming OpenSSL is installed, we checked that the module
was installed, and verified that `crypto.py` was contained in the package
directory.
However, this can cause issues in cases of non-standard installs. In addition,
the `imp.find_module` call already raises an `ImportError` in the case that
the module is missing, so this second check isn't needed.
Instead, we just drop the explicit check for `crypto.py` in the `OpenSSL`
directory.
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