va: Blocklist i965 driver for encoding
The driver - AKA intel-vaapi-driver - has been unmaintained for four years now and encoding appears to be broken in various cases. As it's unlikely that the situation will improve, blocklist the driver for encoding. Decoding appears to be stable enough to keep it enabled.
The driver can still be used by setting the GST_VA_ALL_DRIVERS
env
variable.
Closes #3675 (closed)
Semi-related: #3669 (closed)
Edited by Robert Mader