activex: distribute missing header too

(cherry picked from commit 560a002fec755c82e219dab8ceedd08dbc8b41c0)
Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr>

projects/activex/Makefile.am

@@ -24,6 +24,7 @@ SOURCES_activex = \
     persiststorage.h \
     persiststreaminit.cpp \
     persiststreaminit.h \
+    position.h \
     provideclassinfo.cpp \
     provideclassinfo.h \
     connectioncontainer.cpp \