don't use spring if running on Windows

Author: mrbrdo

lib/spring/binstub.rb

@@ -1,12 +1,15 @@
+require 'rbconfig'
+
 command  = File.basename($0)
 bin_path = File.expand_path("../../../bin/spring", __FILE__)
 
 if command == "spring"
   load bin_path
 else
   disable = ENV["DISABLE_SPRING"]
+  not_windows = !(RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/)
 
-  if disable.nil? || disable.empty? || disable == "0"
+  if not_windows && (disable.nil? || disable.empty? || disable == "0")
     ARGV.unshift(command)
     load bin_path
   end