issue with boltdb and xgo builds

[tehsphinx]

I opened an issue on boltdb package that seems to be closely related to how xgo builds windows 386 binaries.
It would be nice if someone could check the issue out: boltdb/bolt#749

Apples-MBP:src gn$ xgo
Checking docker installation...
Client:
 Version:	17.12.0-ce
 API version:	1.35
 Go version:	go1.9.2
 Git commit:	c97c6d6
 Built:	Wed Dec 27 20:03:51 2017
 OS/Arch:	darwin/amd64

Server:
 Engine:
  Version:	17.12.0-ce
  API version:	1.35 (minimum version 1.12)
  Go version:	go1.9.2
  Git commit:	c97c6d6
  Built:	Wed Dec 27 20:12:29 2017
  OS/Arch:	linux/amd64
  Experimental:	true

2018/03/28 13:43:21 Usage: xgo [options] <go import path>

I'm using xgo-latest docker image.