linux-user: fix build on hosts not using guest base
Commit 68a1c816868b3e35a1da698af412b29e61b1948a broke qemu on hosts not
using guest base. It uses reserved_va unconditionally in mmap.c. To
avoid to many #ifdef #endif blocks, define RESERVED_VA as either
reserved_va or 0ul, and use it instead of reserved_va, similarly to what
has been done with guest_base/GUEST_BASE.
diff --git a/cpu-all.h b/cpu-all.h
index 224ca40..67a3266 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -629,8 +629,10 @@
extern int have_guest_base;
extern unsigned long reserved_va;
#define GUEST_BASE guest_base
+#define RESERVED_VA reserved_va
#else
#define GUEST_BASE 0ul
+#define RESERVED_VA 0ul
#endif
/* All direct uses of g2h and h2g need to go away for usermode softmmu. */
