design/draft-gobuild: remove duplicated aquachain example

Change-Id: I05dad87ced2968a34ac7dd08a574e873d4c7e30a
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/240617
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/design/draft-gobuild.md b/design/draft-gobuild.md
index 40819dd..e1b2e09 100644
--- a/design/draft-gobuild.md
+++ b/design/draft-gobuild.md
@@ -178,12 +178,6 @@
    Unsatisfiable (`!amd64` and `amd64` can’t both be true).\
    Apparently intended `// +build linux,!amd64 linux,amd64,noasm !go1.9`.
 
- - [gitlab.com/aquachain/aquachain](https://gitlab.com/aquachain/aquachain/-/issues/2)
-
-       // +build windows,solaris,nacl nacl solaris windows
-
-   Intended (but at least equivalent to) `// +build nacl solaris windows`.
-
 Later, in June 2020, Alan Donovan wrote some 64-bit specific code that he annotated with:
 
 	//+build linux darwin