Fix debug build for windows

doc/libffi.info

@@ -147,7 +147,9 @@ To prepare a call interface object, use the function `ffi_prep_cif'.
      AVALUES is a vector of `void *' pointers that point to the memory
      locations holding the argument values for a call.  If CIF declares
      that the function has no arguments (i.e., NARGS was 0), then
-     AVALUES is ignored.
+     AVALUES is ignored.  Note that argument values may be modified by
+     the callee (for instance, structs passed by value); the burden of
+     copying pass-by-value arguments is placed on the caller.
 
 
 File: libffi.info,  Node: Simple Example,  Next: Types,  Prev: The Basics,  Up: Using libffi
@@ -577,15 +579,15 @@ Node: Top706
 Node: Introduction1448
 Node: Using libffi3084
 Node: The Basics3570
-Node: Simple Example6177
-Node: Types7204
-Node: Primitive Types7487
-Node: Structures9307
-Node: Type Example10167
-Node: Multiple ABIs11390
-Node: The Closure API11761
-Node: Closure Example14705
-Node: Missing Features16264
-Node: Index16757
+Node: Simple Example6356
+Node: Types7383
+Node: Primitive Types7666
+Node: Structures9486
+Node: Type Example10346
+Node: Multiple ABIs11569
+Node: The Closure API11940
+Node: Closure Example14884
+Node: Missing Features16443
+Node: Index16936
 
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