isatty() requires <unistd.h>

Reported-by: KO Myung-Hun <komh78@gmail.com>

src/config/help.c

@@ -38,6 +38,7 @@ static void PauseConsole (void);
 #else
 # define ShowConsole() (void)0
 # define PauseConsole() (void)0
+# include <unistd.h>
 #endif
 
 static void Help (vlc_object_t *, const char *);

src/libvlc.c

@@ -52,6 +52,9 @@
 #ifdef HAVE_LOCALE_H
 #   include <locale.h>
 #endif
+#ifdef HAVE_UNISTD_H
+#   include <unistd.h> /* isatty() */
+#endif
 
 #ifdef HAVE_DBUS
 /* used for one-instance mode */