3.1 PATCH: Fix libstdc++-v3 bootstrap failure on IRIX 6.2

[Rainer Orth]

Mark Mitchell writes:

> > Ok for branch and mainline if the bootstrap completes without regressions?
> 
> Yes.

installed on mainline.  The bootstrap took 1 1/2 days and finished too late
to make it into 3.1.

	Rainer