libmsc: Use RAND_bytes when choosing a tmsi

Require openssl version to be >= 0.9.5 because we rely on the RAND_bytes
return value.

[hfreyther: Add cast to uint8_t*]
diff --git a/openbsc/tests/db/Makefile.am b/openbsc/tests/db/Makefile.am
index 647b519..be3af5f 100644
--- a/openbsc/tests/db/Makefile.am
+++ b/openbsc/tests/db/Makefile.am
@@ -13,5 +13,5 @@
 		$(top_builddir)/src/libtrau/libtrau.a \
 		$(top_builddir)/src/libcommon/libcommon.a \
 		$(LIBOSMOCORE_LIBS) $(LIBOSMOABIS_LIBS) \
-		$(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS) $(LIBOSMOVTY_LIBS) -ldbi
+		$(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS) $(LIBOSMOVTY_LIBS) $(LIBCRYPTO_LIBS) -ldbi