aubinator: rework print_help()

Rather than using platform specific methods to retrieve the program
name pass it explicitly. The function is called directly from main().

Similarly - basename comes in two versions POSIX (can modify string,
always pass a copy) and GNU (never modifies the string).

Just printout the complete program name, esp. since the program is not
meant to be installed. Thus using $basename is unlikely to work, not to
mention it is misleading.

Reported-by: Timothy Arceri <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Jonathan Gray <[email protected]>

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