make windows include /Iport\win in dependent projects

git-svn-id: https://leveldb.googlecode.com/svn/trunk@27 62dab493-f737-651d-591e-8d6aee1b9529

leveldb.gyp

@@ -47,6 +47,13 @@
         'include_dirs': [
           'include/',
         ],
+        'conditions': [
+          ['OS == "win"', {
+            'include_dirs': [
+              'port/win',
+            ],
+          }],
+        ],
       },
       'sources': [
         # Include and then exclude so that all files show up in IDEs, even if