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

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/cpio.c b/archival/cpio.c
index 9674a04..c2a5b8a 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -12,7 +12,7 @@
  *
  */
 #include "libbb.h"
-#include "archive.h"
+#include "bb_archive.h"
 
 //usage:#define cpio_trivial_usage
 //usage:       "[-dmvu] [-F FILE]" IF_FEATURE_CPIO_O(" [-H newc]")