Heinrich Fink 3107f5df76 facedetect: Fix compiler warning with clang 3.8
Use namespace only after it was actually defined by a header.

gstfacedetect.cpp:79:17: error: using directive refers to implicitly-defined namespace 'std' [-Werror]
using namespace std;
                ^
2016-06-10 11:33:52 +03:00
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