Should fix compilation. Thanks to alienBob for reporting and testing.

modules/video_output/fb.c

@@ -46,6 +46,7 @@
 #include <vlc_common.h>
 #include <vlc_plugin.h>
 #include <vlc_vout.h>
+#include <vlc_interface.h>
 
 /*****************************************************************************
  * Local prototypes

modules/video_output/svgalib.c

@@ -32,6 +32,7 @@
 #include <vlc_common.h>
 #include <vlc_plugin.h>
 #include <vlc_vout.h>
+#include <vlc_interface.h>
 
 #include <vga.h>
 #include <vgagl.h>