clover: Expose cl_khr_extended_versioning

With the extension specification merged in and the last query now
supported, the extension can be advertised.

v2: Fix indentation (Dave Airlie)
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Pierre Moreau <dev@pmoreau.org>
Part-of: <!2078>

src/gallium/frontends/clover/core/device.cpp

@@ -370,6 +370,7 @@ device::supported_extensions() const {
    if (!clover::spirv::supported_versions().empty() &&
        supports_ir(PIPE_SHADER_IR_NIR_SERIALIZED))
       vec.push_back( cl_name_version{ CL_MAKE_VERSION(1, 0, 0), "cl_khr_il_program" } );
+   vec.push_back( cl_name_version{ CL_MAKE_VERSION(1, 0, 0), "cl_khr_extended_versioning" } );
    return vec;
 }