WaE: using directive refers to implicitly-defined namespace 'std'

No C++ std library header has been included and no std API is used
anyway, so the directive is pointless.

Change-Id: Idcb7698a56eb5cc1400f085c2c2cc7424f6f8b03

sc/source/core/opencl/openclwrapper.cxx

@@ -18,7 +18,7 @@
 #include <Windows.h>
 #endif
 //#define USE_KERNEL_FILE
-using namespace std;
+
 GPUEnv OpenclDevice::gpuEnv;
 int OpenclDevice::isInited =0;