Don't work around a ruby bug in the tests that's fixed in 1.9.3. Workaround for r31937 from ruby trunk

Author: drbrain

test/test_rdoc_markup_pre_process.rb

@@ -43,7 +43,7 @@ def test_include_file
     # FIXME 1.9 fix on windoze
     # preprocessor uses binread, so line endings are \r\n
     expected.gsub!("\n", "\r\n") if
-      RUBY_VERSION =~ /^1.9/ && RUBY_PLATFORM =~ /mswin|mingw/
+      RUBY_VERSION < "1.9.3" && RUBY_PLATFORM =~ /mswin|mingw/
 
     assert_equal expected, content
   end
@@ -67,7 +67,7 @@ def test_include_file_encoding_incompatible
     # FIXME 1.9 fix on windoze
     # preprocessor uses binread, so line endings are \r\n
     expected.gsub!("\n", "\r\n") if
-      RUBY_VERSION =~ /^1.9/ && RUBY_PLATFORM =~ /mswin|mingw/
+      RUBY_VERSION < "1.9.3" && RUBY_PLATFORM =~ /mswin|mingw/
 
     assert_equal expected, content
   end