Fix DEBUG build codecs

In DEBUG build, the codec API struct is consider with DEBUG flag in apps/
but without DEBUG flah in rbcodecs/, leading to unmatched structure and horrible
crashes in some cases (mostly encoders). I have no idea why the codecs Makefile
removes the DEBUG flag (maybe for performance reasons?) but it cannot be right.

Change-Id: Idb2c5f66741408ec2939624590fc39c4cf69fc2b

lib/rbcodec/codecs/codecs.make

@@ -30,7 +30,6 @@ ifdef APP_TYPE
  CODECFLAGS += $(SHARED_CFLAGS) # <-- from Makefile
 else
  CODECLDFLAGS = -T$(CODECLINK_LDS) -Wl,--gc-sections -Wl,-Map,$(CODECDIR)/$*.map
- CODECFLAGS += -UDEBUG -DNDEBUG
 endif
 CODECLDFLAGS += $(GLOBAL_LDOPTS)