rename mmap MAP_SHARED to MAP_IPC_SHARED

. MAP_SHARED was used to implement sysv shared memory
	. used to signal shareable memory region to VM
	. assumptions about this situation break when processes
	  use MAP_SHARED for its normal, standardised meaning

servers/is/dmp_vm.c

@@ -56,7 +56,7 @@ PRIVATE void print_region(struct vm_region_info *vri, int *n)
 	(vri->vri_prot & PROT_READ) ? 'r' : '-',
 	(vri->vri_prot & PROT_WRITE) ? 'w' : '-',
 	(vri->vri_prot & PROT_EXEC) ? 'x' : '-',
-	(vri->vri_flags & MAP_SHARED) ? 's' : 'p',
+	(vri->vri_flags & MAP_IPC_SHARED) ? 's' : 'p',
 	vri->vri_length / 1024L);
   (*n)++;
 }