gold patch committed: Make swapping less glibc dependent

[Ian Lance Taylor]

The current code in gold to do byte swapping uses macros which are only
available from glibc.  I committed this patch to make it more flexible.
It will now use the gcc builtin functions if they are available (gcc 4.3
or later), otherwise the glibc <byteswap.h> functions, otherwise inline
functions written in ordinary C++.  Hopefully this will be more
portable.

Ian


gold:/
2009-03-01  Ian Lance Taylor  <iant@google.com>

	* configure.ac: Check for byteswap.h.
	* configure: Rebuild.
	* config.in: Rebuild.

elfcpp:/
2009-03-01  Ian Lance Taylor  <iant@google.com>

	* elfcpp_swap.h: #include "config.h".  Only #include <byteswap.h>
	if HAVE_BYTESWAP_H is defined; if not, provide definitions for
	bswap_{16,32,64}.  For gcc 4.3 and later, use the builtin bswap
	functions.  Check WORDS_BIGENDIAN rather than __BYTE_ORDER.


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