Added htmlhelp.h.

diff --git a/include/Makefile.in b/include/Makefile.in
index 23e6df9..d4f3ced 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -105,6 +105,7 @@
 	fci.h \
 	fdi.h \
 	guiddef.h \
+	htmlhelp.h \
 	icm.h \
 	icmpapi.h \
 	imagehlp.h \