The CURL_CA_BUNDLE environment variable used by freshclam & clamsubmit to
specify a custom path to a CA bundle is undocumented.
Feature was added here: https://bugzilla.clamav.net/show_bug.cgi?id=12504
Resolves: https://github.com/Cisco-Talos/clamav/issues/175
Also document:
- clamd/clamscan: using LD_LIBRARY_PATH to find libclamunrar_iface.so/dylib
- sigtool: using SIGNDUSER, SIGNDPASS for auth creds when building CVD
This info also needs to be added to the online documentation.
IMPORTANT NOTE: --test-sigs now only works against the final target file
(after all processing, normalization, etc. for which the tested
signature was directly created)
