Use more specific path when including memenv.h header

src/Makefile.leveldb.include

@@ -13,7 +13,6 @@ LIBMEMENV = $(LIBMEMENV_INT)
 
 LEVELDB_CPPFLAGS =
 LEVELDB_CPPFLAGS += -I$(srcdir)/leveldb/include
-LEVELDB_CPPFLAGS += -I$(srcdir)/leveldb/helpers/memenv
 
 LEVELDB_CPPFLAGS_INT =
 LEVELDB_CPPFLAGS_INT += -I$(srcdir)/leveldb

src/dbwrapper.cpp

@@ -10,7 +10,7 @@
 #include <leveldb/cache.h>
 #include <leveldb/env.h>
 #include <leveldb/filter_policy.h>
-#include <memenv.h>
+#include <leveldb/helpers/memenv/memenv.h>
 #include <stdint.h>
 #include <algorithm>