Bumping stable efl to 1.7.5.



git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/branches/ethumb-1.7@82180 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33
ethumb: Backport mem leak fixes rev 83818 and 83817

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/branches/ethumb-1.7@83819 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33
ethumb-1.7: Changelof and NEWS entry for backports

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/branches/ethumb-1.7@83821 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33