task.h was included twice.  Removing one fixed a sig11 in gcc-2.7.2.3.

diff --git a/if1632/thunk.c b/if1632/thunk.c
index 95b2557..4b4c557 100644
--- a/if1632/thunk.c
+++ b/if1632/thunk.c
@@ -9,7 +9,6 @@
 #include "wine/winbase16.h"
 #include "hook.h"
 #include "callback.h"
-#include "task.h"
 #include "user.h"
 #include "heap.h"
 #include "module.h"