misc/nacl: add Native Client support scripts and documentation
LGTM=josharian, dan.kortschak
R=golang-codereviews, josharian, dan.kortschak
CC=golang-codereviews
https://golang.org/cl/75080043
diff --git a/misc/nacl/go_nacl_386_exec b/misc/nacl/go_nacl_386_exec
new file mode 100755
index 0000000..9cff635
--- /dev/null
+++ b/misc/nacl/go_nacl_386_exec
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+eval $(go env)
+
+export NACLENV_GOARCH=$GOARCH
+export NACLENV_GOOS=$GOOS
+export NACLENV_GOROOT=/go
+export NACLENV_NACLPWD=$(pwd | sed "s;$GOROOT;/go;")
+
+exec sel_ldr_x86_32 -l /dev/null -S -e "$@"
