Update Racc to 1.4.12

The primary reason for this is that this would let me debug #2343 (closed) using Rubinius' -Xic.debug option.

Somewhat ironically Racc now only crashes when using -Xic.debug. Either way it's good to have a more up to date version of Racc.

Reassigned to @jacobvosmaer

@JobV why assign to me? racc is an indirect dependency of spinach, I rarely work with that.

@jacobvosmaer arbitrary, it was not assigned. Can you assign it to someone more appropriate?

Reassigned to @vsizov

Status changed to merged

mentioned in commit 96b55a0e

mentioned in issue #3599 (closed)