Add libopus to project

Use https://github.com/deltabeard/3ds_portlibs to obtain libopus.

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

Makefile

@@ -53,13 +53,13 @@ CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
 ASFLAGS	:=	-g $(ARCH)
 LDFLAGS	=	-specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
 
-LIBS	:= -lctru -lm
+LIBS	:= -lctru -lm -lopus
 
 #---------------------------------------------------------------------------------
 # list of directories containing libraries, this must be the top level containing
 # include and lib
 #---------------------------------------------------------------------------------
-LIBDIRS	:= $(CTRULIB)
+LIBDIRS	:= $(CTRULIB) $(PORTLIBS)
 
 
 #---------------------------------------------------------------------------------

source/main.c

@@ -10,6 +10,7 @@
 #include <3ds.h>
 #include <dirent.h>
 #include <errno.h>
+#include <opus/opus.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>