Include sys/mman.h before qemu-options.h

The result of parsing qemu-options.def depends on whehter or not
MAP_POPULATE is defined, so make sure to include sys/mman.h before
including qemu-options.h.

Reported by Frank Arnold.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

os-posix.c

@@ -28,6 +28,8 @@
 #include <signal.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+/*needed for MAP_POPULATE before including qemu-options.h */
+#include <sys/mman.h>
 #include <pwd.h>
 #include <libgen.h>