Makefile: Include SortFilterProxyModel's sources in release tarball.

Change-Id: Ia6364b47722feabe8fd8cd88795bebf332643fd7

Makefile

@@ -125,7 +125,10 @@ $(RELEASE_TARBALL_FILENAME): tarballs.manifest
 	rm -f "$@"
 	mkdir $(TMPDIR)/jami-project
 	git archive HEAD | tar xf - -C $(TMPDIR)/jami-project
-	for m in daemon lrc client-qt; do \
+	for m in \
+	    daemon \
+	    client-qt \
+	    client-qt/3rdparty/SortFilterProxyModel; do \
 	  (cd "$$m" && git archive --prefix "$$m/" HEAD \
 		| tar xf - -C $(TMPDIR)/jami-project); \
 	done
@@ -138,6 +141,7 @@ $(RELEASE_TARBALL_FILENAME): tarballs.manifest
 	  --files-from $< \
 	  --transform 's,^.*/,jami-project/daemon/contrib/tarballs/,' \
           $(TAR_REPRODUCIBILITY_OPTIONS)
+# Compress the tarball and move it into place.
 	gzip --no-name $(TMPDIR)/jami-project.tar
 	mv $(TMPDIR)/jami-project.tar.gz "$@"
 	rm -rf $(TMPDIR)