* Security fix for CVE-2009-2688, xemacs: multiple integer overflow flaws.

Patch from gentoo.

* steal  max_align_t declaration from unistd.h to avoid redef.

--- src/lisp.h.orig
+++ src/lisp.h
@@ -193,15 +193,13 @@ void xfree (void *);
 # endif /* GNUC */
 #endif
 
-/* No type has a greater alignment requirement than max_align_t.
-   (except perhaps for types we don't use, like long double) */
-typedef union
-{
-  struct { long l; } l;
-  struct { void *p; } p;
-  struct { void (*f)(void); } f;
-  struct { double d; } d;
+#ifndef __CLANG_MAX_ALIGN_T_DEFINED
+#define __CLANG_MAX_ALIGN_T_DEFINED
+typedef struct {
+	long long __max_align_ll __aligned(__alignof__(long long));
+	long double __max_align_ld __aligned(__alignof__(long double));
 } max_align_t;
+#endif
 
 #ifndef ALIGNOF
 # if defined (__GNUC__) && (__GNUC__ >= 2)
@@ -265,6 +263,11 @@ void assert_failed (const char *, int, const char *);
 /*#define REGISTER register*/
 /*#endif*/
 
+#if SIZEOF_LONG == 8
+#define UINT_64_BIT unsigned long
+#elif SIZEOF_LONG_LONG == 8
+#define UINT_64_BIT unsigned long long
+#endif
 
 /* EMACS_INT is the underlying integral type into which a Lisp_Object must fit.
    In particular, it must be large enough to contain a pointer.