build: no required environment variables

R=adg, r, PeterGo
CC=golang-dev
https://golang.org/cl/1942044
diff --git a/src/pkg/websocket/Makefile b/src/pkg/websocket/Makefile
index 145d8f4..6d3c9cb 100644
--- a/src/pkg/websocket/Makefile
+++ b/src/pkg/websocket/Makefile
@@ -1,4 +1,4 @@
-include ../../Make.$(GOARCH)
+include ../../Make.inc
 
 TARG=websocket
 GOFILES=\