patched by Sokolov Yura. https://github.com/ruby/ruby/pull/78
* dln_find.c: remove useless replacement of free.
* ext/readline/readline.c (readline_attempted_completion_function):
strings for readline must allocated with malloc.
* process.c (run_exec_dup2): use free; see also r20950.
* re.c (onig_new_with_source): use malloc for oniguruma.
* vm.c (ruby_vm_destruct): use free for VMs.
* vm.c (thread_free): use free for threads.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34238 b2dd03c8-39d4-4d8f-98ff-823fe69b080e