Optimized include/*.h: (recursively) include all headers needed by
this .h file, but only those. Necessary fixes to a lot of .c files,
started optimizing "windows.h" away from some of them. Moved
GetCurrentTask prototype to wine/winbase16.h.

diff --git a/console/interface.c b/console/interface.c
index e1d8ed0..afe646b 100644
--- a/console/interface.c
+++ b/console/interface.c
@@ -10,7 +10,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "windows.h"
+#include "windef.h"
 #include "console.h"
 #include "config.h"