Replace build scripts with Makefiles for faster recompiles

jni/nv_alsa/build.sh

@@ -1,4 +0,0 @@
-rm *.o libnv_alsa.so
-gcc -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -I /opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -I ./inc -fPIC -L. -c *.c
-gcc -shared -Wl,-soname,libnv_alsa.so -Wl,--no-undefined -o libnv_alsa.so *.o -L. -lasound
-rm *.o

jni/nv_alsa/makefile

@@ -0,0 +1,17 @@
+CFLAGS   = -I ${JAVA_HOME}/include -I ${JAVA_HOME}/include/linux -fPIC -L.
+LDFLAGS  = -shared -Wl,--no-undefined -L. -lasound
+
+SRCS = nv_alsa.c nv_alsa_jni.c
+TARGET_LIB = libnv_alsa.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