In lsmtest, use an empty string instead of ":memory:" when requesting a

temporary database from SQLite. This prevents other test code from trying to
unlink() ":memory:", which fails on win32.

FossilOrigin-Name: 281ad505d7a112c5524ea9fb195dfc46f819a58f79f42b37b12fbfe46a089ff2

ext/lsm1/lsm-test/lsmtest1.c

@@ -96,7 +96,7 @@ int testControlDb(TestDb **ppDb){
 #ifdef HAVE_KYOTOCABINET
   return tdb_open("kyotocabinet", "tmp.db", 1, ppDb);
 #else
-  return tdb_open("sqlite3", ":memory:", 1, ppDb);
+  return tdb_open("sqlite3", "", 1, ppDb);
 #endif
 }