Missing include for vlm_Delete() usage.

(cherry picked from commit 9f396531)
Signed-off-by: Derk-Jan Hartman <hartman@videolan.org>

src/control/core.c

@@ -25,6 +25,7 @@
 #include <vlc/libvlc.h>
 
 #include <vlc_interface.h>
+#include <vlc_vlm.h>
 
 #include <stdarg.h>
 #include <limits.h>