Similar to 9a93277b (vcl: fix Android
build, 2015-03-06), where the Android has a broken C++ library, having
some functions in the global namespace instead of the std one.

Work around the problem by using the std namespace till it gets fixed on
the Android side.

Change-Id: I3d423f42b4e8e325beb3661c1780378e5edf962d