Fix warning about unused shm_regions

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6001 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 4065917..73427ab 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1614,12 +1614,14 @@
 }
 #endif
 
+#ifdef TARGET_NR_ipc
 #define N_SHM_REGIONS	32
 
 static struct shm_region {
     abi_ulong	start;
     abi_ulong	size;
 } shm_regions[N_SHM_REGIONS];
+#endif
 
 struct target_ipc_perm
 {