The last release of the package dates from 2019.
It depends on the cryptography library python-pycrypto, which has had
its last release in 2013 and "is unmaintained, obsolete, and contains
security vulnerabilities" according to its homepage.
* gnu/packages/jrnl.scm: Remove file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Unregister file.
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