wtplan: fix cross builds

Author: Duncaen

srcpkgs/wtplan/template

@@ -16,8 +16,8 @@ checksum=31c66181f815889828eb2bd3739d6b23582ec75a5a8d6c6bf76c2a6679112bb4
 do_build() {
 	export GOPATH=$(pwd)
 	export VERSIONSTR=$version
-	go generate ./src/wtplan/main.go
-	go generate ./src/wtplan-web/main.go
+	GOARCH= GOARM= go generate ./src/wtplan/main.go
+	GOARCH= GOARM= go generate ./src/wtplan-web/main.go
 	cat <<-EOF >src/wtplan/version.go
 	package main