Update XZ Utils to 5.0.4 (third_party)

tests/create_compress_files.c

 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       create_compress_files.c
 /// \brief      Creates bunch of test files to be compressed
 ///
 /// Using a test file generator program saves space in the source code
 /// package considerably.
 //
 //  Author:     Lasse Collin
 //
@@ skipping 61 matching lines @@
         }
 }
 
 
 // File that repeats "abc\n" a few thousand times. This is targeted
 // especially at Subblock filter's run-length encoder.
 static void
 write_abc(FILE *file)
 {
         for (size_t i = 0; i < 12345; ++i)
-                fwrite("abc\n", 4, 1, file);
+                if (fwrite("abc\n", 4, 1, file) != 1)
+                        exit(1);
 }
 
 
 // File that doesn't compress. We always use the same random seed to
 // generate identical files on all systems.
 static void
 write_random(FILE *file)
 {
         uint32_t n = 5;
 
@@ skipping 55 matching lines @@
 
 
 int
 main(void)
 {
         create_test(abc);
         create_test(random);
         create_test(text);
         return 0;
 }