sql/Makefile: Create empty /var/lib/osmocom directory at install time

Otherwise osmo-hlr is unable to start correctly.

Change-Id: I1233fc9b3dc685561f79a34e1c32c459dc1aa685
diff --git a/sql/Makefile.am b/sql/Makefile.am
index 75be70e..e84943b 100644
--- a/sql/Makefile.am
+++ b/sql/Makefile.am
@@ -5,3 +5,10 @@
 
 sqldir = $(docdir)/sql
 sql_DATA = $(srcdir)/hlr.sql $(srcdir)/hlr_data.sql
+
+
+install-data-local:
+	$(MKDIR_P) $(DESTDIR)$(localstatedir)/lib/osmocom
+
+uninstall-hook:
+	rm -rf $(DESTDIR)$(localstatedir)/lib/osmocom