Update george_plays_with_opencv.c

compile with

gcc -I/usr/include/opencv -lopencv_calib3d -lopencv_contrib -lopencv_core -lopen
cv_features2d -lopencv_flann -lopencv_highgui -lopencv_imgproc -lopencv_legacy - 
lopencv_ml -lopencv_objdetect -lopencv_photo -lopencv_stitching -lopencv_superre
s -lopencv_ts -lopencv_video -lopencv_videostab -lm george_plays_with_opencv.c -o george.out