sim/ppc PAGE_SIZE redefinition

[CHIGOT, CLEMENT]

Hi, 

I'm not able to build "sim/ppc" anymore on AIX. 
I'm not exactly sure what have changed since there was a lot of commit 
recently. 
But there is a redefinition of PAGE_SIZE (which is defined in AIX includes).

In file included from icache.c:29:
semantics.h:32: error: "PAGE_SIZE" redefined [-Werror]
   32 | #define PAGE_SIZE 0x1000
      | 
In file included from /opt/freeware/src/packages/BUILD/gcc-build-master/gcc/include-fixed/stdio.h:580,
                 from ../../../sim/ppc/basics.h:82,
                 from ../../../sim/ppc/cpu.h:24,
                 from icache.c:27:
/usr/include/sys/limits.h:392: note: this is the location of the previous definition
  392 | #define PAGE_SIZE       4096            /* page size granularity of memory */

Is this PAGE_SIZE constant is supposed to be link to host defines or is it safe to 
rename it PAGE_SIZE_1k or something like that ? 

Thanks,

Clément Chigot
ATOS Bull SAS
1 rue de Provence - 38432 Échirolles - France