[rubygems/rubygems] Handle Errno::EADDRNOTAVAIL gracefully

As showed by the unskiped spec, on Windows trying to use the 0.0.0.0
interface raises this error, and it's raised as a generic system error
when trying to create a `bundler.lock` file. Here's is a better place to
handle that.

e32c5a9e5c

lib/bundler/fetcher.rb

@@ -76,6 +76,7 @@ module Bundler
       Gem::Timeout::Error,
       EOFError,
       SocketError,
+      Errno::EADDRNOTAVAIL,
       Errno::ENETDOWN,
       Errno::ENETUNREACH,
       Errno::EINVAL,

spec/bundler/commands/install_spec.rb

@@ -690,8 +690,6 @@ RSpec.describe "bundle install with gem sources" do
     end
 
     it "gracefully handles error when rubygems server is unavailable" do
-      skip "networking issue" if Gem.win_platform?
-
       install_gemfile <<-G, artifice: nil, raise_on_error: false
         source "https://gem.repo1"
         source "http://0.0.0.0:9384" do