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/windows/class.c b/windows/class.c
index ddd8efe..69db221 100644
--- a/windows/class.c
+++ b/windows/class.c
@@ -14,6 +14,7 @@
#include <stdlib.h>
#include <string.h>
+#include "wine/winbase16.h"
#include "class.h"
#include "heap.h"
#include "win.h"
