fibheap.h (struct fibnode): Only use unsigned long bitfields when __GNUC__ is defined and ints are less...

[include]
	* fibheap.h (struct fibnode): Only use unsigned long bitfields
	when __GNUC__ is defined and ints are less than 32-bits wide.
[libiberty]
	* configure.ac: Invoke AC_CHECK_SIZEOF for sizeof (int).
	* configure: Regenerate.
	* config.in: Likewise.

From-SVN: r92009