Fix macOS build

Author: floppyhammer

src/RtlUsbAdapter.cpp

@@ -1,7 +1,7 @@
 #include "RtlUsbAdapter.h"
 
 #include <chrono>
-#if defined(__ANDROID__) || defined(_MSC_VER)
+#if defined(__ANDROID__) || defined(_MSC_VER) || defined(__APPLE__)
 #include <libusb.h>
 #else
 #include <libusb-1.0/libusb.h>

txdemo/main.cpp

@@ -10,7 +10,9 @@
   #define fork() (0)
   #define sleep(seconds) Sleep((seconds)*1000)
 #elif defined(__ANDROID__)
-  // On Android, include the libusb header as required.
+  #include <libusb.h>
+#elif defined(__APPLE__)
+  #include <unistd.h>
   #include <libusb.h>
 #else
   #include <libusb-1.0/libusb.h>