[BUG] War Machine incorrectly expects bonus part files to be named with the _bonus suffix

[paulo-santana]

I saw that the issue #14 stated that the bonus files (about linked lists) are expected to be ended with _bonus.c. But this is false. The _bonus suffix is meant to name files that contains functions which weren't asked in the subject.

I don't believe Moulinette will mark a file name as wrong, since they don't specify any. But this behavior makes this tester the only which doesn't grade the linked list bonus functions.

[0x050f]

Should work for both (with or without _bonus) in 4bd5b64 :)