Wine Mono / Gecko packages are already cached in a contrib folder,
and downloading them outside of proton source directory is brittle.
This also makes the source sync run twice when using the toplevel
Makefile.
Since the migration off Vagrant we no longer need to copy Proton
installation from the VM to the host. This was replaced with a `make
install` invoked using the new build system which already puts things in
the right place. This render install-internal an unnecessary no-op.
Add https://github.com/jp7677/dxvk-nvapi as a submodule. dxvk-nvapi will
not be copied into Proton prefixes by default, but instead will be
controlled via the environment variable PROTON_ENABLE_NVAPI. This is
done to avoid any potential adverse effects of the nvapi DLL existing
in cases where an application may require a function that is not
implemented by dxvk-nvapi.
This new functionality can be enabled by setting the following environment
variable to a value of `1`:
`PROTON_ENABLE_NVAPI`
This functionality is needed in order to support DLSS within Proton.
Reviewed-by: Adam Moss <amoss@nvidia.com>
Andrew Eikum
Rémi Bernon
Arkadiusz Hiler
Derek Lesho
Liam Middlebrook