Just made a warning go away when building optimized version of the compiler

[r15732]

ir/ir/irprintf_t.h

@@ -39,10 +39,13 @@
 
 static INLINE void ir_debugf(const char *fmt, ...)
 {
+	(void) fmt;
 }
 
 static INLINE void ir_fdebugf(FILE *f, const char *fmt, ...)
 {
+	(void) f;
+	(void) fmt;
 }
 
 #endif