Remove includes from internal header files.

src/libespeak-ng/espeak_command.h

 #ifndef ESPEAK_COMMAND_H
 #define ESPEAK_COMMAND_H
 
-#include <unistd.h>
-
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/event.c

 #include <pthread.h>
 #include <semaphore.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/time.h>

src/libespeak-ng/fifo.c

 #include <errno.h>
 #include <pthread.h>
 #include <semaphore.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/time.h>
 #include <espeak-ng/espeak_ng.h>
 
 #include "speech.h"
+#include "espeak_command.h"
 #include "fifo.h"
 #include "wave.h"
 

src/libespeak-ng/fifo.h

 // Helps to add espeak commands in a first-in first-out queue
 // and run them asynchronously.
 
-#include "espeak_command.h"
-
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/speech.c

 #include <ctype.h>
 #include <errno.h>
 #include <locale.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "synthesize.h"
 #include "voice.h"
 #include "translate.h"
+#include "espeak_command.h"
 #include "fifo.h"
 #include "event.h"
 #include "wave.h"

src/libespeak-ng/speech.h

 #ifndef SPEECH_H
 #define SPEECH_H
 
-#include <sys/types.h>
-
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/wave.c

 #include <assert.h>
 #include <math.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

src/libespeak-ng/wave.h

 /*
  * Copyright (C) 2007, Gilles Casse <[email protected]>
- * Copyright (C) 2015 Reece H. Dunn
+ * Copyright (C) 2015-2016 Reece H. Dunn
  * based on AudioIO.cc (Audacity-1.2.4b) and wavegen.cpp
  *
  * This program is free software; you can redistribute it and/or modify
 #ifndef WAVE_H
 #define WAVE_H
 
-#ifndef PLATFORM_DOS
-#include "stdint.h"
-#endif
-
 #ifdef __cplusplus
 extern "C"
 {