GN: Apply optimize_max only on windows

webrtc/build/webrtc.gni

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
@@ skipping 162 matching lines @@
 # normally shouldn't need to include this in your target as it's automatically
 # included when using the rtc_* templates. It set the defines, include paths and
 # compilation warnings that should be propagated to dependents of the targets
 # depending on the target having this config.
 rtc_common_inherited_config = webrtc_root + ":common_inherited_config"
 
 # Common configs to remove or add in all rtc targets.
 rtc_remove_configs = []
 rtc_add_configs = [ rtc_common_config ]
 
-if (!is_debug) {
+if (!is_debug && is_win) {
   rtc_remove_configs += [ "//build/config/compiler:default_optimization" ]
   rtc_add_configs += [ "//build/config/compiler:optimize_max" ]
 }
 
 set_defaults("rtc_test") {
   configs = rtc_add_configs
   suppressed_configs = []
 }
 
 set_defaults("rtc_source_set") {
@@ skipping 84 matching lines @@
                            ])
     configs += invoker.configs
     configs -= rtc_remove_configs
     configs -= invoker.suppressed_configs
     public_configs = [ rtc_common_inherited_config ]
     if (defined(invoker.public_configs)) {
       public_configs += invoker.public_configs
     }
   }
 }