don't run git during the regress suite.

Index: test/irc.lua
--- test/irc.lua.orig
+++ test/irc.lua
@@ -2,7 +2,7 @@ local server_port = (os.getenv("IRC_HOST_PORT") or "ir
 local channel = os.getenv("IRC_CHANNEL")
 local url = os.getenv("JOB_URL") or "???"
 
-local remote = io.popen("git remote get-url origin 2> /dev/null"):read('*l')
+local remote = nil
 if remote == nil then
     -- no git / no git repo, this is not an upstream CI job
     return function() end
