Fixed a lot of warnings for possible problems.
diff --git a/windows/winproc.c b/windows/winproc.c
index 925b173..371656b 100644
--- a/windows/winproc.c
+++ b/windows/winproc.c
@@ -211,7 +211,7 @@
(void(*)())WINPROC_CallProc16To32A :
(void(*)())WINPROC_CallProc16To32W;
proc->thunk.t_from16.lcall = 0x9a; /* lcall cs:relay */
- proc->thunk.t_from16.relay = Callbacks->CallFrom16WndProc;
+ proc->thunk.t_from16.relay = (void*)Callbacks->CallFrom16WndProc;
GET_CS(proc->thunk.t_from16.cs);
proc->jmp.jmp = 0xe9;
/* Fixup relative jump */