Make build.sh executable on *nix platforms
Make build.sh executable on *nix platforms

This will fix "permission denied errors" when trying to run the script on Linux and OS X.

jamesqo/libvideo,nguyenkien/libvideo,nguyenkien/libvideo,James-Ko/libvideo,PFCKrutonium/libvideo,i3arnon/libvideo,shads196770/libvideo,James-Ko/libvideo,jamesqo/libvideo,shads196770/libvideo,PFCKrutonium/libvideo