Reformat repo to clang-format 7.0 rules

Source/Core/VideoBackends/OGL/PerfQuery.h

@@ -81,4 +81,4 @@ private:
   void FlushOne();
 };
 
-}  // namespace
+}  // namespace OGL

Source/Core/VideoBackends/OGL/SamplerCache.h

@@ -43,4 +43,4 @@ private:
 };
 
 extern std::unique_ptr<SamplerCache> g_sampler_cache;
-}
+}  // namespace OGL

Source/Core/VideoBackends/OGL/StreamBuffer.cpp

@@ -392,4 +392,4 @@ std::unique_ptr<StreamBuffer> StreamBuffer::Create(u32 type, u32 size)
   // default fallback, should work everywhere, but isn't the best way to do this job
   return std::make_unique<MapAndOrphan>(type, size);
 }
-}
+}  // namespace OGL