Add support for the "memdb" VFS and the sqlite3_memdb_ptr() and
sqlite3_memdb_config() interfaces, to enable an SQLite database to be
manipulated as an in-memory object.

FossilOrigin-Name: fb2ac2d2fa6374084f3325b41b257c7a3ace43aade4b666ec4be93b6b70dc39a
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 8e79133..002fb4e 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -4019,6 +4019,10 @@
 const char *sqlite3ErrName(int);
 #endif
 
+#ifdef SQLITE_ENABLE_MEMDB
+int sqlite3MemdbInit(void);
+#endif
+
 const char *sqlite3ErrStr(int);
 int sqlite3ReadSchema(Parse *pParse);
 CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);