Hi,

This patch series adds $SSL_CERT_DIR/$SSL_CERT_FILE to youtube-dl, some
dependents and w3m, as they respect $SSL_CERT_DIR/$SSL_CERT_FILE.

To make this easier (e.g. less duplication), I moved the definition of
$SSL_CERT_DIR/$SSL_CERT_FILE to a single location (guix search-paths)
instead of many separate packages.

This moving was previously rejected by Ludo, but that was in a
different context, maybe in this context it's considered ok?

TODO:

 * [ ] build dependents

Greetings,
Maxime.