Add build condition not to build in iOS an unused lib (failing to build empty lib in iOS). Unreviewed.

Review URL: https://codereview.chromium.org/12639008

git-svn-id: http://skia.googlecode.com/svn/trunk@8047 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/tools.gyp

@@ -268,6 +268,11 @@
         'tools.gyp:picture_utils',
       ],
     },
+  ],
+  'conditions': [
+    ['skia_win_debuggers_path and skia_os == "win"',
+      {
+        'targets': [
           {
             'target_name': 'win_dbghelp',
             'type': 'static_library',
@@ -280,6 +285,9 @@
             ],
           },
         ],
+      },
+    ],
+  ],
 }
 
 # Local Variables: