[RFA] sync include/ansidecl.h with GCC

[Nick Clifton]

Hi Mark,

: 2000-05-06  Zack Weinberg  <zack@wolery.cumb.org>
: 
:         * ansidecl.h: #define __extension__ to nothing if
:         GCC_VERSION < 2008.

Approved.

Cheers
	Nick