Port V2 to Linux

[PoroCYon]

• Use Linux-style public symbol names (sym instead of _sym@blah)
• Rewrite inline assembly in v2mplayer.cpp as C++, or use GNU-style inline assembly
• #define __stdcall away when WIN32 isn't defined
• Disable Ronan by default (but can be switched on if you want)
• Emulate cdecl because stdcall isn't a thing on Linux

Might work on FreeBSD as well.

Example playback code here