vl.c: Fix OpenBSD compilation issue due to namespace collisions

Machine rewriting added MACHINE() macro which is
already in use by other OpenBSD library.
Since qemu/sockets.h exposes the OpenBSD namespace,
the minimalistic approach is to add it as the first QEMU include.

Reported-by: Brad Smith <brad@comstyle.com>
Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

include/hw/boards.h

@@ -54,6 +54,7 @@ struct QEMUMachine {
 int qemu_register_machine(QEMUMachine *m);
 
 #define TYPE_MACHINE "machine"
+#undef MACHINE  /* BSD defines it and QEMU does not use it */
 #define MACHINE(obj) \
     OBJECT_CHECK(MachineState, (obj), TYPE_MACHINE)
 #define MACHINE_GET_CLASS(obj) \

vl.c

@@ -58,6 +58,7 @@ int main(int argc, char **argv)
 
 #include <glib.h>
 
+#include "qemu/sockets.h"
 #include "hw/hw.h"
 #include "hw/boards.h"
 #include "hw/usb.h"
@@ -103,7 +104,6 @@ int main(int argc, char **argv)
 
 #include "disas/disas.h"
 
-#include "qemu/sockets.h"
 
 #include "slirp/libslirp.h"