include: Add cmdbas.idl.

include/Makefile.in

diff --git a/include/Makefile.in b/include/Makefile.in
index f5b2dfd..8048c01 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -117,6 +117,7 @@
 	cguid.h \
 	cierror.h \
 	clusapi.h \
+	cmdbas.idl \
 	commctrl.h \
 	commctrl.rh \
 	commdlg.h \