win32.c: adjust type

* win32/win32.c (NtCmdLineElement): use long instead of int for
  rb_w32_wstr_to_mbstr.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45593 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-16

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e