Also remove git files of matlab/modules/ from tarball.

(cherry picked from commit 5d96e8c2)

Makefile.am

@@ -39,7 +39,7 @@ dist-hook:
 	rm -rf `find $(distdir)/matlab $(distdir)/examples -name *~`
 	rm -rf $(distdir)/matlab/preprocessor* $(distdir)/matlab/dynare_version.m
 	$(MKDIR_P) $(distdir)/mex/matlab $(distdir)/mex/octave
-	rm -rf `find $(distdir)/contrib -name '.git*'`
+	rm -rf `find $(distdir) -name '.git*'`
 
 install-exec-local:
 	$(MKDIR_P) $(DESTDIR)$(pkglibdir)/contrib/ms-sbvar/TZcode