PATCH: Use unsigned long int in __bswap_64 for __WORDSIZE == 64

[Roland McGrath]

> 2012-10-09  H.J. Lu  <hongjiu.lu@intel.com>
> 
> 	* sysdeps/x86/bits/byteswap.h [__WORDSIZE == 64](__bswap_64): 
> 	Use unsigned long int for GCC >= 4.2.

This should look like:

	* sysdeps/x86/bits/byteswap.h [__GNUC_PREREQ (4, 2)]
	[__WORDSIZE == 64] (__bswap_64): New implementation, uses
	'unsigned long int' rather than 'unsigned long long int'
	in argument and return types.

It's still my preference to define a macro for the type and just
change all the appearances of either 'unsigned long long' or
'unsigned long' in this file to use that macro.


Thanks,
Roland