Replace split with lines.

Author: aardvark179

lib/truffle/truffle/cext_preprocessor.rb

@@ -96,7 +96,7 @@ def self.patch(file, contents, directory)
             # preprocessor macro which _must_ end with a newline and
             # so requires that we preserve the trailing whitespace.
             patched_file[:patches].each do |patch|
-              last_line = patch[:replacement].rstrip.split("\n").last.lstrip
+              last_line = patch[:replacement].rstrip.lines.last.lstrip
               contents = contents.gsub(patch[:match],
                                        if last_line && last_line.start_with?('#')
                                          patch[:replacement]