Pull more recent gyp.

This pulls in https://chromiumcodereview.appspot.com/10079030/
and https://chromiumcodereview.appspot.com/10876082/ among others,
which are needed for more *nix platforms support.

Review URL: https://codereview.chromium.org/10983022
Patch from Paweł Hajdan Jr. <phajdan.jr@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@12612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

DEPS

@@ -5,7 +5,7 @@
 deps = {
   # Remember to keep the revision in sync with the Makefile.
   "v8/build/gyp":
-    "http://gyp.googlecode.com/svn/trunk@1282",
+    "http://gyp.googlecode.com/svn/trunk@1501",
 }
 
 deps_os = {

Makefile

@@ -280,6 +280,7 @@ $(ENVFILE).new:
 	    echo "CXX=$(CXX)" >> $(ENVFILE).new
 
 # Dependencies.
+# Remember to keep these in sync with the DEPS file.
 dependencies:
 	svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
-	    --revision 1282
+	    --revision 1501