[Gc] patch for gc to work on newer NetBSD releases

[tsugutomo.enami at jp.sony.com]

Ivan Maidanski <ivmai at mail.ru> writes:

> Committed your patch (with some modifications) to master branch
> (7.3alpha3). Please check.
> I'll commit to release branch (gc7.2) as well after testing.

Thanks.  I'll test it.

> Q: Which is newer NetBSD? I guess rel 9.0, right?

No.  I mean (not yet released) NetBSD 6.0.  It is currently in second
beta testing state (NetBSD 6.0_BETA2).  Also, the change was necessary
for the people who are using NetBSD-current of 5.99.19 or newer
(developing version).

enami.