Add a prediff file to squash C error message line numbers...

... for test genericArrayInClass-otharrs-inline-iterators.
Looking at the failure log for numa, I thought the mismatch was from additional numbers at the end of the line?
For example, the .bad mismatch shows:
< In file included from obj/_main.c:18:
---
> In file included from obj/_main.c:18:0:

So I don't think this actually solves the problem (although the test will pass more robustly now)