Support thin source gem builds on Windows

gistfile1.diff

diff --git a/lib/thin.rb b/lib/thin.rb
index 10b5ff3..83e96ba 100644
--- a/lib/thin.rb
+++ b/lib/thin.rb
@@ -41,8 +41,14 @@ require "#{Thin::ROOT}/rack/adapter/loader"
 
 if Thin.win?
   # Select proper binary under Windows
-  major_ruby_version = RUBY_VERSION[/^(\d+\.\d+)/]
-  require "#{Thin::ROOT}/#{major_ruby_version}/thin_parser"
+  begin
+    # fat binary gem
+    major_ruby_version = RUBY_VERSION[/^(\d+\.\d+)/]
+    require "#{Thin::ROOT}/#{major_ruby_version}/thin_parser"
+  rescue LoadError
+    # source gem (eg - gem install thin --platform=ruby)
+    require "#{Thin::ROOT}/thin_parser"
+  end
 else
   require "#{Thin::ROOT}/thin_parser"
 end