include: Added IDL file for BITS.

include/Makefile.in

diff --git a/include/Makefile.in b/include/Makefile.in
index 932a56d..2104454 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -9,6 +9,7 @@
 	amstream.idl \
 	amvideo.idl \
 	austream.idl \
+	bits.idl \
 	comcat.idl \
 	control.idl \
 	d3d10.idl \