GN: Add -Wl,-z defs on linux and fix errors

ui/wm/BUILD.gn

Index: ui/wm/BUILD.gn
diff --git a/ui/wm/BUILD.gn b/ui/wm/BUILD.gn
index ea50577c4cc091d231911250e2de5ede37ad5ed9..d5e3f2932221c32d0dfc097be73d815b4959a639 100644
--- a/ui/wm/BUILD.gn
+++ b/ui/wm/BUILD.gn
@@ -2,6 +2,8 @@
 # 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")
+
 component("wm") {
   sources = [
     "core/accelerator_delegate.h",
@@ -86,6 +88,10 @@ component("wm") {
     "//ui/gfx/geometry",
     "//ui/resources",
   ]
+
+  if (use_x11) {
+    configs += [ "//build/config/linux:x11" ]
+  }
 }
 
 static_library("test_support") {