laserproxy: add nix build

Change-Id: If93f4ba69afa028fed9098663a523f46d6134f7c
diff --git a/hswaw/laserproxy/nix-use-system-go.patch b/hswaw/laserproxy/nix-use-system-go.patch
new file mode 100644
index 0000000..15584f2
--- /dev/null
+++ b/hswaw/laserproxy/nix-use-system-go.patch
@@ -0,0 +1,13 @@
+diff --git a/third_party/nix/repository_rules.bzl b/third_party/nix/repository_rules.bzl
+index 35c3d2d..3386d4b 100644
+--- a/third_party/nix/repository_rules.bzl
++++ b/third_party/nix/repository_rules.bzl
+@@ -16,7 +16,7 @@ def hscloud_go_register_toolchains():
+     imports_for_non_nix = """
+ load("@io_bazel_rules_go//go:deps.bzl", "go_rules_dependencies", "go_register_toolchains")
+ def hscloud_go_register_toolchains():
+-    go_register_toolchains()
++    go_register_toolchains(go_version="host")
+ """
+ 
+     if has_nix(ctx):