Started on avifil32 implementation (only stubs currently).

diff --git a/include/debugdefs.h b/include/debugdefs.h
index 062fe3d..9f9ad39 100644
--- a/include/debugdefs.h
+++ b/include/debugdefs.h
@@ -4,7 +4,7 @@
 #include "debugtools.h"
 #endif
 
-#define DEBUG_CHANNEL_COUNT 152
+#define DEBUG_CHANNEL_COUNT 153
 #ifdef DEBUG_RUNTIME
 short debug_msg_enabled[][DEBUG_CLASS_COUNT] = {
 {1, 1, 0, 0},
@@ -159,6 +159,7 @@
 {1, 1, 0, 0},
 {1, 1, 0, 0},
 {1, 1, 0, 0},
+{1, 1, 0, 0},
 };
 const char* debug_ch_name[] = {
 "accel",
@@ -166,6 +167,7 @@
 "animate",
 "aspi",
 "atom",
+"avifile",
 "bitblt",
 "bitmap",
 "caret",