if !defined _WIN32 should be either ifndef _WIN32 or if !defined(_WIN32)

- and merge some ASM/SSM code

* destroy some mutex'es once in a while to prevent memleaks. Suggested by a forumuser, name pending. 

with mb_str(wxConvUTF8)

Should be fixed at configure stage

(vlc 0.9.0 is definitely not going to be ABI-compatible with 0.8.6).