Update XZ Utils to 5.0.4 (third_party)

tests/create_compress_files.c

Index: tests/create_compress_files.c
===================================================================
--- tests/create_compress_files.c	(revision 87706)
+++ tests/create_compress_files.c	(working copy)
@@ -79,7 +79,8 @@
 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);
 }