Typo "possition"

[ph3-der-loewe]

The "possition"-typo should be fixed in all files:

./include/libroar/vs.h.bak:/* get server's possition of stream
./include/libroar/vs.h.bak: * returns server's possition of the stream or -1 on error.
./include/libroar/vs.h.bak: * The retruned server possition is the possition in samples
./libroar/vs.c: size_t  lpos; // local possition
./libroar/vio_buffer.c: // get in sync with current possition, flush all buffers,...
./ChangeLog:    * corrected possition of -ls on linker commands in most Makefiles
./roard/roard.c:uint32_t g_pos; // current possition in output stream
./roard/include/roard.h:extern uint32_t g_pos; // current possition in output stream
./doc/new-cmds: +:destination possition (TODO)
./doc/new-cmds: +:destination possition whence (TODO)
./doc/new-cmds: +:destination possition quality (TODO)
./doc/new-cmds: +HQ_BAD_NB    = 1 #(bad, not before this possition)
./doc/new-cmds: +HQ_NEAR_NB   = 3 #(Near, not before this possition)
./doc/new-cmds: +HQ_GOOD_NB   = 5 #(good, not before this possition)