Why __WORDSIZE_COMPAT32 is off for x86_64?

[Denys Vlasenko]

libc/sysdeps/linux/x86_64/bits/wordsize.h:

/* Determine the wordsize from the preprocessor defines.  */

#if defined __x86_64__
# define __WORDSIZE     64
/*# define __WORDSIZE_COMPAT32  1*/
#else
# define __WORDSIZE     32
#endif

This breaks /var/run/utmp format.
This makes any tool which uses /var/run/utmp to misbehave
on a system where some other parts are based on glibc:

https://bugzilla.redhat.com/show_bug.cgi?id=541587

Whoever commented it out forgot to explain *why*
he commented it out. I propose uncommenting it.

Please ACK or apply attached patch.
--
vda
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