Roll gyp 1852:1854

Changes:
r1854: Cache Xcode version at the module level
r1853: ninja: Let TOC code use $lib instead of ${lib}.

BUG=https://code.google.com/p/gyp/issues/detail?id=408
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/170833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251817 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -135,7 +135,7 @@ deps = {
     (Var("googlecode_url") % "grit-i18n") + "/trunk@151",
 
   "src/tools/gyp":
-    (Var("googlecode_url") % "gyp") + "/trunk@1852",
+    (Var("googlecode_url") % "gyp") + "/trunk@1854",
 
   "src/tools/swarming_client":
     Var("chromium_git") + "/external/swarming.client.git@" +