Fix includes for the OE Pal.

The Pal should include address.h, this was masked as other Pals included
it, but are only included for simulating OE scenarios, rather than
the actual build for OE.

src/pal/pal.h

@@ -3,6 +3,9 @@
 #include "pal_consts.h"
 
 // If simultating OE, then we need the underlying platform
+#if defined(OPEN_ENCLAVE)
+#  include "pal_open_enclave.h"
+#endif
 #if !defined(OPEN_ENCLAVE) || defined(OPEN_ENCLAVE_SIMULATION)
 #  include "pal_apple.h"
 #  include "pal_freebsd.h"
@@ -12,9 +15,6 @@
 #  include "pal_openbsd.h"
 #  include "pal_windows.h"
 #endif
-#if defined(OPEN_ENCLAVE)
-#  include "pal_open_enclave.h"
-#endif
 #include "pal_plain.h"
 
 namespace snmalloc

src/pal/pal_open_enclave.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "ds/address.h"
 #include "pal_plain.h"
 #ifdef OPEN_ENCLAVE
 extern "C" const void* __oe_get_heap_base();