Set false to @proxy_from_env to suppress uninitialized warning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36490 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/http.rb

@@ -967,6 +967,7 @@ module Net   #:nodoc:
           @proxy_address = nil
           @proxy_port    = nil
         else
+          @proxy_from_env = false
           @proxy_address = p_addr
           @proxy_port    = p_port || default_port
         end