Daniel Stone authored Dec 29, 2022 and Marius Vlad committed Jan 10, 2023

Similar to the backend type, also expose the renderer type enum as ABI.
This makes it possible to implement a more consistent config API, as
opposed to every backend hand-rolling its own use-the-other-one bool.

The enums are explicitly numbered to avoid 0, so 0 can be used as a
'not-specified' sentinel value to allow backwards compatibility with the
old config interfaces.

Signed-off-by: Daniel Stone <daniels@collabora.com>