[PATCH] libgomp: Include <limits.h> early to avoid link failure with glibc 2.34

[Florian Weimer]

* Florian Weimer:

> I tested this on csky-linux-gnuabiv2 with the glibc version that failed
> before, and it works.  So I guess your version is fine, too.

Build on powerpc64-linux-gnu and other targets now fails with:

/home/bmg/src/gcc/libgomp/config/linux/affinity.c: In function ‘gomp_init_affini
ty’:
/home/bmg/src/gcc/libgomp/config/linux/affinity.c:53:41: error: ‘ULONG_MAX’ unde
clared (first use in this function)
   53 |       if (!gomp_affinity_init_level (1, ULONG_MAX, true))
      |                                         ^~~~~~~~~

So affinity.c will need to include <limits.h>.

Thanks,
Florian