libmmeif: Makefile fix

Change-Id: Id3fae50714802a4e2a5a82fcdfcee5b640f47e37
Signed-off-by: Jakub Grajciar <Jakub.Grajciar@pantheon.tech>
diff --git a/extras/libmemif/Makefile.am b/extras/libmemif/Makefile.am
index 070ed3f..292eb9c 100644
--- a/extras/libmemif/Makefile.am
+++ b/extras/libmemif/Makefile.am
@@ -82,7 +82,7 @@
 
 check_PROGRAMS = unit_test
 
-include_HEADERS = src/libmemif.h
+include_HEADERS = src/libmemif.h src/memif.h
 
 lib_LTLIBRARIES = libmemif.la