Use system-wide trust certificate store

Currently, spice-gtk will look in $HOME/.spicec/spice_truststore.pem
by default for its trust certificate store (to verify the certificates
used during SPICE TLS connections).
However, these days, progress is under-way to have a system-wide
certificate store [1].
In order to use it, we only need to call SSL_CTX_set_default_verify_paths()
and it will automatically use the shared system CA store if the distro
is properly setup.
We only try to use that store if there was no user-provided CA file to use,
or if we failed to load it.

[1] https://fedoraproject.org/wiki/Features/SharedSystemCertificates

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