Use correct relative include path

src/hidapi/libusb/hid.c

@@ -40,7 +40,7 @@
 #include <libusb.h>
 #include <locale.h> /* setlocale */
 
-#include "hidapi.h"
+#include "../hidapi/hidapi.h"
 
 #ifdef NAMESPACE
 namespace NAMESPACE

src/hidapi/linux/hid.c

@@ -50,7 +50,7 @@
 #include <linux/input.h>
 #include <libudev.h>
 
-#include "hidapi.h"
+#include "../hidapi/hidapi.h"
 
 #ifdef NAMESPACE
 namespace NAMESPACE

src/hidapi/mac/hid.c

@@ -33,7 +33,7 @@
 #include <sys/time.h>
 #include <unistd.h>
 
-#include "hidapi.h"
+#include "../hidapi/hidapi.h"
 
 /* Barrier implementation because Mac OSX doesn't have pthread_barrier.
  It also doesn't have clock_gettime(). So much for POSIX and SUSv2.