build: fix mingw build of vbox

More fallout from commit 7c9a2d88 dropping too many headers.  Fixes:

In file included from ../../src/vbox/vbox_glue.c:26:0:
../../src/vbox/vbox_MSCOMGlue.c: In function 'vboxLookupVersionInRegistry':
../../src/vbox/vbox_MSCOMGlue.c:435:5: error: implicit declaration of function 'virParseVersionString' [-Werror=implicit-function-declaration]
...
../../src/vbox/vbox_driver.c: In function 'vboxConnectOpen':
../../src/vbox/vbox_driver.c:147:5: error: implicit declaration of function 'getuid' [-Werror=implicit-function-declaration]
../../src/vbox/vbox_driver.c:147:5: error: nested extern declaration of 'getuid' [-Werror=nested-externs]

* src/vbox/vbox_MSCOMGlue.c (includes): Add missing includes.
* src/vbox/vbox_driver.c (includes): Likewise.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/vbox/vbox_MSCOMGlue.c

@@ -2,6 +2,7 @@
 /*
  * vbox_MSCOMGlue.c: glue to the MSCOM based VirtualBox API
  *
+ * Copyright (C) 2013 Red Hat, Inc.
  * Copyright (C) 2010-2011 Matthias Bolte <matthias.bolte@googlemail.com>
  *
  * This library is free software; you can redistribute it and/or
@@ -33,6 +34,8 @@
 #include "viralloc.h"
 #include "virlog.h"
 #include "virerror.h"
+#include "virstring.h"
+#include "virutil.h"
 #include "vbox_MSCOMGlue.h"
 
 #define VIR_FROM_THIS VIR_FROM_VBOX

src/vbox/vbox_driver.c

@@ -3,7 +3,7 @@
  */
 
 /*
- * Copyright (C) 2010-2012 Red Hat, Inc.
+ * Copyright (C) 2010-2013 Red Hat, Inc.
  * Copyright (C) 2008-2009 Sun Microsystems, Inc.
  *
  * This file is part of a free software library; you can redistribute
@@ -38,6 +38,7 @@
 #include "vbox_driver.h"
 #include "vbox_glue.h"
 #include "virerror.h"
+#include "virutil.h"
 
 #define VIR_FROM_THIS VIR_FROM_VBOX