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

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/libarchive/get_header_ar.c b/archival/libarchive/get_header_ar.c
index df603b1..23c4124 100644
--- a/archival/libarchive/get_header_ar.c
+++ b/archival/libarchive/get_header_ar.c
@@ -5,7 +5,7 @@
  */
 
 #include "libbb.h"
-#include "archive.h"
+#include "bb_archive.h"
 #include "ar.h"
 
 static unsigned read_num(const char *str, int base)