Add puppycam for better camera

[arainot]

In the sm64ex repo, you can add the command "BETTERCAMERA=1" when building to add a better camera than the outdated N64 camera system. I'd suggest to try adding it to the building_ios.sh file's last line so that the final line reads:
"gmake ios -j4 TARGET_IOS=1 TARGET_OS_IOS=1 BETTERCAMERA=1"

[arainot]

@ckosmic Would it also make sense to base the port on the sm64ex nightly which has a wide range of new features compared to the main release?