Build PPAPI NaCl Glibc tests with GN

ppapi/native_client/BUILD.gn

 # Copyright 2015 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/features.gni")
+import("//build/config/nacl/config.gni")
 
 if (is_nacl) {
   group("ppapi_lib") {
     deps = [
-      "//native_client/src/untrusted/pthread",
       "//ppapi/native_client/src/untrusted/irt_stub:ppapi_stub_lib",
     ]
+    if (!is_nacl_glibc) {
+      # Glibc has its version of pthread library.
+      deps += [ "//native_client/src/untrusted/pthread" ]
+    }
   }
 
   executable("nacl_irt") {
     deps = [
       "//base",
       "//components/tracing",
       "//gpu/command_buffer/client",
       "//gpu/command_buffer/common",
       "//gpu/command_buffer/client:gles2_implementation",
       "//gpu/ipc",
@@ skipping 29 matching lines @@
     outputs = [
       "${root_build_dir}/{{source_name_part}}_${suffix}.nexe",
     ]
     deps = [
       ":nacl_irt",
     ]
   }
 }
 
 group("irt") {
-  deps = [
-    ":nacl_irt_copy(//build/toolchain/nacl:irt_${target_cpu})",
-  ]
+  data_deps = [ ":nacl_irt_copy(//build/toolchain/nacl:irt_${target_cpu})" ]
 }