Update XZ Utils to 5.0.4 (third_party)

src/common/sysdefs.h

 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       sysdefs.h
 /// \brief      Common includes, definitions, system-specific things etc.
 ///
 /// This file is used also by the lzma command line tool, that's why this
 /// file is separate from common.h.
 //
 //  Author:     Lasse Collin
 //
@@ skipping 85 matching lines @@
 #               define PRIx64 "lx"
 #       endif
 #       ifndef PRIX64
 #               define PRIX64 "lX"
 #       endif
 #endif
 #ifndef UINT64_MAX
 #       define UINT64_MAX UINT64_C(18446744073709551615)
 #endif
 
-// Interix has broken header files, which typedef size_t to unsigned long,
-// but a few lines later define SIZE_MAX to INT32_MAX.
-#ifdef __INTERIX
+// Incorrect(?) SIZE_MAX:
+//   - Interix headers typedef size_t to unsigned long,
+//     but a few lines later define SIZE_MAX to INT32_MAX.
+//   - SCO OpenServer (x86) headers typedef size_t to unsigned int
+//     but define SIZE_MAX to INT32_MAX.
+#if defined(__INTERIX) || defined(_SCO_DS)
 #       undef SIZE_MAX
 #endif
 
 // The code currently assumes that size_t is either 32-bit or 64-bit.
 #ifndef SIZE_MAX
 #       if SIZEOF_SIZE_T == 4
 #               define SIZE_MAX UINT32_MAX
 #       elif SIZEOF_SIZE_T == 8
 #               define SIZE_MAX UINT64_MAX
 #       else
@@ skipping 61 matching lines @@
 #       define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
 #endif
 
 #if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
 #       define lzma_attr_alloc_size(x) __attribute__((__alloc_size__(x)))
 #else
 #       define lzma_attr_alloc_size(x)
 #endif
 
 #endif