fake.rb.in: split by whitespaces not to be affected by -F option

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67609 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

template/fake.rb.in

@@ -45,6 +45,6 @@ eval(File.binread(fake), nil, fake)
 ropt = "-r#{__FILE__}"
 ["RUBYOPT"].each do |flag|
   opt = ENV[flag]
-  opt = opt ? ([ropt] | opt.b.split).join(" ") : ropt
+  opt = opt ? ([ropt] | opt.b.split(/\s+/)).join(" ") : ropt
   ENV[flag] = opt
 end