winegcc: fix memory leak (found by Smatch).

[Lionel_Debroux]

"build" in tools/winegcc/winegcc.c gets flagged by Michael Stefaniuc's
unfree-wine.pl script.

2007-10-27  Lionel Debroux <lionel_debroux at yahoo.fr>
        * tools/winegcc/winegcc.c:
        winegcc: fix memory leak (found by Smatch).
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