virt-aa-helper: Fix build by including virutil.h

Commit fb01e1a4 missed including virutil.h, causing the following
compilation error

../../src/security/virt-aa-helper.c:1055:43: error: implicit declaration of
function 'virHostGetDRMRenderNode' [-Werror=implicit-function-declaration]
1055 |                 char *defaultRenderNode = virHostGetDRMRenderNode();
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

src/security/virt-aa-helper.c

@@ -41,6 +41,7 @@
 #include "virxml.h"
 #include "viruuid.h"
 #include "virusb.h"
+#include "virutil.h"
 #include "virpci.h"
 #include "virfile.h"
 #include "configmake.h"