util/drirc: add workarounds for bugs in Doom 3: BFG

This makes the game playable on radeonsi.

Cc: "19.0" "19.1" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110143

src/util/00-mesa-defaults.conf

@@ -111,6 +111,11 @@ TODO: document the other workarounds.
             <option name="allow_glsl_builtin_variable_redeclaration" value="true" />
         </application>
 
+        <application name="Doom 3: BFG" executable="Doom3BFG.exe">
+            <option name="allow_glsl_builtin_variable_redeclaration" value="true" />
+            <option name="force_glsl_extensions_warn" value="true" />
+        </application>
+
         <application name="Dying Light" executable="DyingLightGame">
             <option name="allow_glsl_builtin_variable_redeclaration" value="true" />
         </application>