Silence two compiler warnings on DOS-like systems.

src/common/tuklib_open_stdxxx.c

@@ -23,7 +23,11 @@
 extern void
 tuklib_open_stdxxx(int err_status)
 {
-#ifndef TUKLIB_DOSLIKE
+#ifdef TUKLIB_DOSLIKE
+	// Do nothing, just silence warnings.
+	(void)err_status;
+
+#else
 	for (int i = 0; i <= 2; ++i) {
 		// We use fcntl() to check if the file descriptor is open.
 		if (fcntl(i, F_GETFD) == -1 && errno == EBADF) {

src/xz/file_io.c

@@ -327,6 +327,9 @@ io_open_src(file_pair *pair)
 			return true;
 		}
 	}
+#else
+	// Avoid warnings.
+	(void)follow_symlinks;
 #endif
 
 	// Try to open the file. If we are accepting non-regular files,