Replace build scripts with Makefiles for faster recompiles

jni/nv_opus_dec/build.sh

@@ -1,4 +0,0 @@
-rm *.o libnv_opus_dec.so
-gcc -I include -I $JAVA_HOME/include/ -I $JAVA_HOME/include/linux -I /usr/include/opus -fPIC -c *.c
-gcc -shared -Wl,-soname,libnv_opus_dec.so -Wl,--no-undefined -o libnv_opus_dec.so *.o -L. -lopus
-rm *.o

jni/nv_opus_dec/makefile

@@ -0,0 +1,17 @@
+CFLAGS   = -I ${JAVA_HOME}/include -I ${JAVA_HOME}/include/linux -I /usr/include/opus -fPIC -L.
+LDFLAGS  = -shared -Wl,--no-undefined -lopus -L.
+
+SRCS = nv_opus_dec_jni.c nv_opus_dec.c
+TARGET_LIB = libnv_opus_dec.so
+
+OBJS = $(SRCS:.c=.o)
+
+$(TARGET_LIB): $(OBJS)
+	$(CC) ${LDFLAGS} -o $@ $^
+
+all: $(TARGET_LIB)
+
+clean:
+	rm -f ${TARGET_LIB} ${OBJS} $(SRCS:.c=.d)
+
+.PHONY: all clean