hswaw/laserproxy: fix nix build

This bitrot at some point. Now it's all freshened up.

Change-Id: Ia7df1ccd9b39d9180131452e9bf18d0fb8fa50d5
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1163
Reviewed-by: informatic <informatic@hackerspace.pl>
diff --git a/hswaw/laserproxy/nix-use-system-go.patch b/hswaw/laserproxy/nix-use-system-go.patch
index 15584f2..92880f5 100644
--- a/hswaw/laserproxy/nix-use-system-go.patch
+++ b/hswaw/laserproxy/nix-use-system-go.patch
@@ -1,13 +1,11 @@
-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")
- """
+--- a/WORKSPACE	2021-10-07 21:56:55.869547029 +0200
++++ b/WORKSPACE	2021-10-16 20:23:37.841448038 +0200
+@@ -63,7 +63,7 @@
+ # Setup Go toolchain.
+ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains")
  
-     if has_nix(ctx):
+-go_register_toolchains(version = "1.17")
++go_register_toolchains(go_version = "host")
+ 
+ # IMPORTANT: match protobuf version above with the one loaded by grpc
+ http_archive(