Race condition fix?

[Lenbok]

Describe the bug

Thanks for picking up this project! I had been having a look at the forks of the original lighttiger repo and found this and a couple of others. One fork I noticed that had some development was https://github.com/mazrean/slqls (perhaps @mazrean would like to contribute here), in particular it looks like there may have been a race condition detected in some Makefile enhancements that they fixed in mazrean@dab8c3a

I really don't know go, so can't comment on the validity, just thought it might be worth pointing out here, so feel free to close if this is invalid.

[mattn]

Yes, please send me fix.