Update V8 DEPS.

Rolling v8/build/gyp to adb7d24b9fc166f01ab2da50478556b518a9218f

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/868573002

Cr-Commit-Position: refs/heads/master@{#26209}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build/gyp":
-    Var("git_url") + "/external/gyp.git" + "@" + "194ec65a55edf24c1976d4265f57e8c90ef5bb2f",
+    Var("git_url") + "/external/gyp.git" + "@" + "adb7d24b9fc166f01ab2da50478556b518a9218f",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "4e3266f32c62d30a3f9e2232a753c60129d1e670",
   "v8/buildtools":