[PATCH] Fix building gdb-7.0 on x86_64-*-freebsd

[Steve Kargl <sgk@troutmask.apl.washington.edu>]

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The attach patch allows gdb-7.0 (and 6.8) to build 
on x86_64-*-freebsd.  Revision 189903 of FreeBSD's
sys/amd64/include/pcb.h removed the pcb_fs, pcb_gs,
pcb_ds, and pcb_es members of the structure.

-- 
Steve

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--- amd64fbsd-nat.c.orig	2009-10-12 14:38:56.000000000 -0700
+++ amd64fbsd-nat.c	2009-10-12 14:40:13.000000000 -0700
@@ -95,6 +95,7 @@
 
 #include <sys/types.h>
 #include <machine/pcb.h>
+#include <osreldate.h>
 
 #include "bsd-kvm.h"
 
@@ -123,10 +124,12 @@
   regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
   regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
   regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
+#if (__FreeBSD_version <  900000)
   regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
   regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
   regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
   regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
+#endif
 
   return 1;
 }