Respect LDFLAGS to allow customized link options

Some platform may have its own specific link options, e.g. Broadcom.

Makefile

@@ -31,7 +31,7 @@ LIBVOICE:
 	$(MAKE) -C libvoice
 
 $(VOICEMNGR): LIBVOICE $(OBJS)
-	$(CC) $(CFLAGS) -o $@ $(OBJS) $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
 
 clean:
 	rm -f *.o $(VOICEMNGR)

libvoice/Makefile

@@ -29,7 +29,7 @@ all: debug $(LIBVOICE)
 	$(CC) $(CFLAGS) -fPIC -c -o $@ $<
 
 $(LIBVOICE): $(OBJS)
-	$(CC) $(CFLAGS) -shared -o $@ $^ $(LIBS)
+	$(CC) $(CFLAGS) -shared $(LDFLAGS) -o $@ $^ $(LIBS)
 
 clean:
 	rm -f *.o $(LIBVOICE)