allow the user to chose in which directory the temporary file

allow the user to chose in which directory the temporary file
will be created. The logic is the following:

 * if the environment variable TMPDIR is set, use its value
 * if it is not set, take the directory passed with the
   -td option (see edje_cc help)
 * otherwise on Windows use a temporary dir and on other
   platform, use /tmp

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/edje@41978 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33