type fix for ARM in FakeBkgTools utility script
another one spotted by @christos: char may be unsigned (e.g. on ARM architectures) so is unsuitable as a type to hold the return value of getopt_long which can be -1. Changing to int.
another one spotted by @christos: char may be unsigned (e.g. on ARM architectures) so is unsuitable as a type to hold the return value of getopt_long which can be -1. Changing to int.