This patch removes conditional appending of "-race" flag.
It is needed as we build in PIE mode and race is incompatible with that.

https://bugs.gentoo.org/955442
--- a/build.go
+++ b/build.go
@@ -396,7 +396,7 @@
 	}
 	args = append(args, "-timeout", timeout)
 
-	if runtime.GOARCH == "amd64" {
+	if false {
 		switch runtime.GOOS {
 		case buildpkg.Darwin, buildpkg.Linux, buildpkg.FreeBSD: // , "windows": # See https://github.com/golang/go/issues/27089
 			args = append(args, "-race")