profiles: add CURL_QUIC USE_EXPAND

The CURL_QUIC USE_EXPAND enables us to sanely manage QUIC (RFC 9000)
backends as they are added to cURL in the future: currently there are
two supported implementations, OpenSSL and ngtcp2,  however it's likely
that other popular TLS libraries will expose QUIC APIs over time,
and that these will be eventually be supported by cURL (see CURL_SSL
for examples of TLS libraries that we support) - we may as well
get ahead of the curve here.

There are already a number of other small players (i.e. OpenSSL Forks)
exposing QUIC support for quite a while, however these have not been
available in ::gentoo and we've only needed the one USE to enable
for HTTP/3 and QUIC to this point.

Signed-off-by: Matt Jolly <kangie@gentoo.org>

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