Add flac support

Not working properly due to decoding flac in to 32 bit buffer instead of
16 bit.

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/main.h

@@ -14,5 +14,3 @@
  * \return			Zero if successful, else failure.
  */
 int playWav(const char *wav);
-
-int playOpus(const char *opus);