Do not install LICENSE.md files of submodules under /usr/lib/dynare/matlab.

(cherry picked from commit 801154db)

Makefile.am

@@ -46,6 +46,7 @@ install-exec-local:
 	cp -r contrib/ms-sbvar/TZcode/MatlabFiles $(DESTDIR)$(pkglibdir)/contrib/ms-sbvar/TZcode
 	cp -r examples $(DESTDIR)$(pkglibdir)
 	cp -r matlab $(DESTDIR)$(pkglibdir)
+	find $(DESTDIR)$(pkglibdir) -name LICENSE.md -delete
 	rm -rf $(DESTDIR)$(pkglibdir)/matlab/preprocessor*
 	{ \
 	if [ -z "`file preprocessor/dynare_m | grep x86.64`" ]; then \