Use correct define for libarchive version number in archive.h.

Signed-off-by: Andres Mejia <amejia004@gmail.com>

Author: martinpitt

examples/untar.c

@@ -199,7 +199,7 @@ copy_data(struct archive *ar, struct archive *aw)
 	int r;
 	const void *buff;
 	size_t size;
-#if ARCHIVE_VERSION >= 3000000
+#if ARCHIVE_VERSION_NUMBER >= 3000000
 	int64_t offset;
 #else
 	off_t offset;