qapi/qmp-registry.c: Include headers it needs

Include:
- <glib.h> for g_malloc0()
- <string.h> for strcmp()

Some of those headers were probably being included by accident because
some other headers were including qemu-common.h, but those headers
should eventually stop including qemu-common.h.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

qapi/qmp-registry.c

@@ -12,6 +12,8 @@
  *
  */
 
+#include <glib.h>
+#include <string.h>
 #include "qapi/qmp-core.h"
 
 static QTAILQ_HEAD(QmpCommandList, QmpCommand) qmp_commands =