rename archive.h to bb_archive.h. no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/bbunzip.c b/archival/bbunzip.c
index bb1ec0e..9c1a737 100644
--- a/archival/bbunzip.c
+++ b/archival/bbunzip.c
@@ -5,7 +5,7 @@
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 #include "libbb.h"
-#include "archive.h"
+#include "bb_archive.h"
 
 enum {
 	OPT_STDOUT     = 1 << 0,