Use cross-platform ruby mktmpdir in comparelinks.rb

_contrib/comparelinks.rb

@@ -3,12 +3,7 @@
 
 ## Example: ruby ./_contrib/comparelinks.rb master newbranch > ../diff
 
-WORKDIR = `mktemp -d`
-WORKDIR.gsub!("\n",'')
-
-at_exit {
-	`rm -fr "#{WORKDIR}"`
-}
+require 'tmpdir'
 
 def prompt(*args)
     print(*args)
@@ -52,6 +47,10 @@ def fetchlinks()
 
 end
 
+Dir.mktmpdir{|workdir|
+
+	WORKDIR=workdir.gsub("\n",'')
+
 	# Copy current repository to a temporary directory
 	`rsync -a ./ "#{WORKDIR}/"`
 
@@ -92,3 +91,5 @@ if diffrmlinks.length > 0
 		diff = diff + "## links removed\n\n" + diffrmlinks.join("\n") + "\n\n"
 	end
 	print diff
+
+}