Build fixes for fnl/musl

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 # This target will be built if no target is specified when invoking ninja.
 group("default") {
   testonly = true
 
   deps = [
     "//apps",
     "//benchmarks",
     "//crypto:crypto_unittests",
     "//examples",
     "//mojo",
     "//mojom",
     "//services",
     "//shell",
   ]
 
-  if (is_linux) {
+  # TODO(cstout): fix sandbox build for fnl/musl
+  if (is_linux && !is_fnl) {
     deps += [
       "//sandbox/linux:sandbox",
       "//sandbox/linux:sandbox_linux_unittests",
     ]
-    if (!use_ozone) {
-      deps += [ "//tools/xdisplaycheck" ]
-    }
+  }
+  if (is_linux && !use_ozone) {
+    deps += [ "//tools/xdisplaycheck" ]
   }
 
   if (is_linux || is_android) {
     deps += [
       "//ui/events:events_unittests",
       "//ui/gfx:gfx_unittests",
     ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/ozone",
       "//ui/ozone/demo",
       "//ui/ozone:ozone_unittests",
     ]
   }
 }
 
 # Deprecated name for the default build target.
 group("root") {
   testonly = true
   deps = [
     ":default",
   ]
 }