[Buildroot] go receipe not installing go.env

[Phil Williams]

I ran into this issue when using the toolchain compiled with buildroot: 
https://github.com/golang/go/issues/61928

Aparently the default GOPROXY configuration is now read from GOROOT/go.env.

I made the following change which fixed my issue:

diff --git a/package/go/go.mk b/package/go/go.mk
index 9efd4a31..d031fd25 100644
--- a/package/go/go.mk
+++ b/package/go/go.mk
@@ -153,6 +153,8 @@ define HOST_GO_INSTALL_CMDS

         cp -a $(@D)/lib $(HOST_GO_ROOT)/

+       cp -a $(@D)/go.env $(HOST_GO_ROOT)/
+
         mkdir -p $(HOST_GO_ROOT)/pkg
         cp -a $(@D)/pkg/include $(HOST_GO_ROOT)/pkg/
         cp -a $(@D)/pkg/tool $(HOST_GO_ROOT)/pkg/

I don't know enough about buildroot or go as to whether this would be 
useful for others.

If someone can confirm it is, I will following the procedure and 
properly submit a patch.

Thanks