Remove unnecessary <iostream> from execution time sample
Remove unnecessary <iostream> from execution time sample

rollbear/CppSamples-Samples,brunotag/CppSamples-Samples,vjacquet/CppSamples-Samples,thatbrod/CppSamples-Samples,sftrabbit/CppSamples-Samples,tmwoz/CppSamples-Samples