Use fsync instead of aof_fsync in final AOF sync.

This happens in the child process so we don't care about latency:
better to sync metadata as well.

src/aof.c

@@ -990,7 +990,7 @@ int rewriteAppendOnlyFile(char *filename) {
 
     /* Make sure data will not remain on the OS's output buffers */
     if (fflush(fp) == EOF) goto werr;
-    if (aof_fsync(fileno(fp)) == -1) goto werr;
+    if (fsync(fileno(fp)) == -1) goto werr;
     if (fclose(fp) == EOF) goto werr;
 
     /* Use RENAME to make sure the DB file is changed atomically only