external/audiocodec: fix undefined inline functions
Inline functions in audio codec were being shown as undefined.
Add -O2 flag for audiocodec to inline the functions.
@@ -60,7 +60,7 @@ CSRCS += $(notdir $(wildcard ./mp3dec/*.c))
CSRCS += $(notdir $(wildcard ./aacdec/*.c))
CFLAGS += -D__TINYARA__
-CFLAGS += -std=c99
+CFLAGS += -std=c99 -O2
AOBJS = $(ASRCS:.S=$(OBJEXT))
COBJS = $(CSRCS:.c=$(OBJEXT))
