use .get_file() instead of basename(3)

On OpenBSD the compiler complains that calling basename(3) would lose
const qualifier.  basename(3) is defined as

	char *basename(char *);

and can, accorgindly to the POSIX.1, modify the passed string.

This uses the .get_file() method.  The check is necessary because
file_name could be a directory, in which case .get_file() would return
an empty string.  The .get_base_dir().get_file() idiom is already used.

The usage of get_file() and the check were suggested by theraot, thanks!

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