drirc: Allow extension midshader for Divinity: Original Sin (EE)

See also <https://bugs.freedesktop.org/show_bug.cgi?id=93551#c27> where
this was first observed as a requirement.

Signed-off-by: Kai Wasserbäch <kai@dev.carbon-project.org>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/drivers/dri/common/drirc

@@ -100,5 +100,9 @@ TODO: document the other workarounds.
         <application name="Rust" executable="rust">
             <option name="glsl_zero_init" value="true"/>
         </application>
+
+        <application name="Divinity: Original Sin Enhanced Edition" executable="EoCApp">
+            <option name="allow_glsl_extension_directive_midshader" value="true" />
+        </application>
     </device>
 </driconf>