sys-limits.h on illumos

[Andy Fiddaman]

There's a compatibility problem with the guard definition used in the
sys-limits.h file that affects illumos (an opensolaris derivative) and most
likely Solaris too.

These operating systems have a /usr/include/sys/limits.h file which uses the
_SYS_LIMITS_H guard. Since the same guard is used in the gnulib sys-limits.h,
we are finding that as packages update their copies of gnulib, compilation
breaks (most recently we experienced this with coreutils, grep and tar -
usually the symptom is that SYS_BUFSIZE_MAX is not defined).

Would it be possible to replace _SYS_LIMITS_H in sys-limits.h with something
else in order to resolve this problem?

Thanks,

Andy