rbinstall.rb: shell code as comments

* tool/rbinstall.rb (PROLOG_SCRIPT): wrap shell code by
  =begin/=end as comments.  [ruby-core:83202] [Bug#13997]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60171 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/rbinstall.rb

@@ -429,6 +429,7 @@ def CONFIG.[](name, mandatory = false)
 if load_relative or /\s/ =~ bindir
   PROLOG_SCRIPT = <<EOS
 #!/bin/sh\n# -*- ruby -*-
+_=_\\\n=begin
 bindir="#{load_relative ? '${0%/*}' : bindir.gsub(/\"/, '\\\\"')}"
 EOS
   if CONFIG["LIBRUBY_RELATIVE"] != 'yes' and libpathenv = CONFIG["LIBPATHENV"]
@@ -438,7 +439,7 @@ def CONFIG.[](name, mandatory = false)
 export #{libpathenv}="$libdir${#{libpathenv}:+#{pathsep}$#{libpathenv}}"
 EOS
   end
-  PROLOG_SCRIPT << %Q[exec "$bindir/#{ruby_install_name}" -x "$0" "$@"\n]
+  PROLOG_SCRIPT << %Q[exec "$bindir/#{ruby_install_name}" "-x" "$0" "$@"\n=end\n]
 else
   PROLOG_SCRIPT = nil
 end