Fix build warnings

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

source/all.h

@@ -1,9 +1,6 @@
 #include <errno.h>
 #include <stdio.h>
 
-/* Channel to play music on */
-#define CHANNEL	0x08
-
 /* Adds extra debugging text */
 //#define DEBUG
 
@@ -14,13 +11,3 @@
 
 #define delete(ptr) \
 	free((void*) ptr); ptr = NULL
-
-struct decoder_fn
-{
-	int (* init)(const char* file);
-	uint32_t (* rate)(void);
-	uint8_t (* channels)(void);
-	int buffSize;
-	uint64_t (* decode)(void*);
-	void (* exit)(void);
-};