Revert homogenize msvs and ninja library_dir and libraries settings for

test/library_dirs/subdir/test.gyp

 # Copyright (c) 2013 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       # This creates a static library and puts it in a nonstandard location for
       # libraries-search-path-test.
       'target_name': 'mylib',
@@ skipping 33 matching lines @@
       ],
       'sources': [
         'hello.cc',
       ],
       # Note that without this, the mylib library would not be found and
       # successfully linked.
       'library_dirs': [
         '<(abs_path_to_secret_library_location)',
       ],
       'link_settings': {
-        'libraries': [
-          '-lmylib',
-        ],
+        'conditions': [
+          ['OS=="linux"', {
+            'libraries': [
+              '-lmylib',
+            ],
+          }, { # else
+            'libraries': [
+              '<(STATIC_LIB_PREFIX)mylib<(STATIC_LIB_SUFFIX)',
+            ],
+          }],
+        ],  # conditions
       },
     },
   ],
 }