Fix handling of integrity check type in the xz command line tool.

src/xz/args.c

@@ -294,10 +294,17 @@ parse_real(args_info *args, int argc, char **argv)
 			size_t i = 0;
 			while (strcmp(types[i].str, optarg) != 0) {
 				if (++i == ARRAY_SIZE(types))
-					message_fatal(_("%s: Unknown integrity"
+					message_fatal(_("%s: Unsupported "
+							"integrity "
 							"check type"), optarg);
 			}
 
+			// Use a separate check in case we are using different
+			// liblzma than what was used to compile us.
+			if (!lzma_check_is_supported(types[i].check))
+				message_fatal(_("%s: Unsupported integrity "
+						"check type"), optarg);
+
 			coder_set_check(types[i].check);
 			break;
 		}

src/xz/process.c

@@ -51,7 +51,11 @@ static bool preset_default = true;
 static bool preset_extreme = false;
 
 /// Integrity check type
+#ifdef HAVE_CHECK_CRC64
 static lzma_check check = LZMA_CHECK_CRC64;
+#else
+static lzma_check check = LZMA_CHECK_CRC32;
+#endif
 
 
 extern void