Libmv: Update to latest upstream version

Main purpose of this is to bring new gflags library which is more likely
to have a fix for undefined order of static variables initialization and
also to bring new glog where some compilation error are fixed (which are
only visible with more strict checks with clang and c++11 enabled).

tests/gtests/testing/testing_main.cc

@@ -28,7 +28,7 @@
 
 int main(int argc, char **argv) {
   testing::InitGoogleTest(&argc, argv);
-  google::ParseCommandLineFlags(&argc, &argv, true);
+  gflags::ParseCommandLineFlags(&argc, &argv, true);
   google::InitGoogleLogging(argv[0]);
 
   return RUN_ALL_TESTS();