Fix for impostors being fullbright when deferred rendering enabled.

indra/newview/app_settings/shaders/class1/deferred/impostorF.glsl

@@ -11,7 +11,8 @@ uniform sampler2D specularMap;
 
 void main() 
 {
-	gl_FragData[0] = texture2D(diffuseMap, gl_TexCoord[0].xy);
+	vec4 col = texture2D(diffuseMap, gl_TexCoord[0].xy);
+	gl_FragData[0] = vec4(col.rgb, col.a <= 0.5 ? 0.0 : 0.005);
 	gl_FragData[1] = texture2D(specularMap, gl_TexCoord[0].xy);
 	gl_FragData[2] = vec4(texture2D(normalMap, gl_TexCoord[0].xy).xyz, 0.0);
 }