Core: "Initial support for C++11 compilers"

src/server/game/Entities/Unit/Unit.cpp

@@ -16985,8 +16985,8 @@ void Unit::JumpTo(float speedXY, float speedZ, bool forward)
         GetMotionMaster()->MoveJumpTo(angle, speedXY, speedZ);
     else
     {
-        float vcos = cos(angle+GetOrientation());
-        float vsin = sin(angle+GetOrientation());
+        float vcos = std::cos(angle+GetOrientation());
+        float vsin = std::sin(angle+GetOrientation());
 
         WorldPacket data(SMSG_MOVE_KNOCK_BACK, (8+4+4+4+4+4));
         data.append(GetPackGUID());