Not everyone has <unistd.h>, some files need <io.h> too (msvc).

diff --git a/programs/wineconsole/curses.c b/programs/wineconsole/curses.c
index 0f32d93..a5c3acd 100644
--- a/programs/wineconsole/curses.c
+++ b/programs/wineconsole/curses.c
@@ -42,7 +42,9 @@
 #include <ncurses.h>
 #endif
 #undef KEY_EVENT  /* avoid redefinition warning */
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <windef.h>
 #include <winbase.h>
 #include <winnls.h>