compile_prelude.rb: remove comments

* tool/compile_prelude.rb (translate): remove comments which are
  not used in compiled sources.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46687 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/compile_prelude.rb

@@ -45,6 +45,7 @@ class Prelude
     lines = []
     @preludes[filename] = result = [@preludes.size, filename, lines, sub]
     File.readlines(filename).each do |line|
+      line.sub!(/(?:^|\s+)\#(?:$|\s.*)/, '')
       line.gsub!(/RbConfig::CONFIG\["(\w+)"\]/) {
         key = $1
         unless @mkconf