golang: v↑ to go1.11

Don't drop support for Go1.9, as, even though Go1.9 is no longer
supported, software/gitlab depends on it.

Our Go1.10.X is also too outdated, but I'm not touching it here neither.

/cc @alain.takoudjou, @luke

component/golang/buildout.cfg

@@ -53,6 +53,15 @@ md5sum = d15dfb264105c5e84fbe33f4a4aa5021
 environment-extra =
   GOROOT_BOOTSTRAP=${golang14:location}
 
+[golang1.11]
+<= golang-common
+url = https://dl.google.com/go/go1.11.4.src.tar.gz
+md5sum = a77697673215be465d1b583680ef2318
+
+# go1.11 needs go1.4 to bootstrap
+environment-extra =
+  GOROOT_BOOTSTRAP=${golang14:location}
+
 
 # ---- infrastructure to build Go workspaces / projects ----
 

component/helloweb/buildout.cfg

@@ -89,7 +89,7 @@ input   = inline:
 recipe  = slapos.recipe.cmmi
 path    = ${helloweb-repository:location}/go/
 
-go      = ${golang19:location}/bin/go
+go      = ${golang1.11:location}/bin/go
 configure-command = :
 make-binary =
 make-targets= cd ${:path} &&