Move an inline definition to a more appropriate source

Alc/midi/base.c

@@ -16,6 +16,9 @@
 #include "alu.h"
 
 
+extern inline size_t Reader_read(Reader *self, void *buf, size_t len);
+
+
 /* MIDI events */
 #define SYSEX_EVENT  (0xF0)
 

Alc/midi/sf2load.c

@@ -12,8 +12,6 @@
 #include "midi/base.h"
 
 
-extern inline size_t Reader_read(Reader *self, void *buf, size_t len);
-
 static ALuint read_le32(Reader *stream)
 {
     ALubyte buf[4];