[fixincludes] Allow properly defining __cplusplus with Solaris headers (PR libstdc++-v3/1773)

[Bruce Korb]

On Tue, Aug 9, 2011 at 2:35 AM, Rainer Orth <ro@cebitec.uni-bielefeld.de> wrote:
> Ok for mainline (no point in backporting to release branches since this
> will never be used)?

Hi Rainer,

"never be used"?  OK.  Looks good to me.  Cheers - Bruce