[PATCH] fibheap.h __extension__ for GNUC

[Kazu Hirata]

Hi Andreas,

> this one cures the bootstrap on ppclinux for me. According to Andrew 
> Pinski it is an obvious one.
> :
> 2003-12-19  Andreas Tobler  <a.tobler@schweiz.ch>
> 
> 	* include/fibheap.h (fibnode): Use __extension__ for
> 	bit-fields mark and degree if __GNUC__.
> 

I was thinking this might be obvious.  It turns out Diego thinks so,
too.  So committed as obvious.

By the way, also bootstrapped on i686-pc-linux-gnu with C only for a
quick check.

Kazu Hirata