winecfg fixes

[Crestez Leonard]

This patch makes a bunch of small winecfg fixes. Since most of them are
just a few lines in length I don't think it's worth splitting them.

Changelog:
	winecfg: fix add application (memory error)
	winecfg: fix apply button lighting up in audio tab
	winecfg: fix video tab(crash when checking desktop, apply button not
lighting up
	winecfg: fix apply button in libraries tab, fix memory leak in
parse_override, remove horrible abuse of macros in set_dllmode
-- 
Crestez Leonard <cleonard at go.ro>