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_alloca() for Win32

--- a/libcelt/stack_alloc.h

+++ b/libcelt/stack_alloc.h

@@ -97,7 +97,13 @@

 #elif defined(USE_ALLOCA)

 #define VARDECL(type, var) type *var

-#define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))

+

+# ifdef WIN32

+#  define ALLOC(var, size, type) var = ((type*)_alloca(sizeof(type)*(size)))

+# else

+#  define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))

+# endif

+

 #define SAVE_STACK

 #define RESTORE_STACK

 #define ALLOC_STACK