Do not use private sha256.h header file in the public exported

API header file (xbps_api.h).

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091022124921-nvy2x07ibxjqtt50

bin/xbps-digest/main.c

@@ -30,6 +30,7 @@
 #include <string.h>
 
 #include <xbps_api.h>
+#include "sha256.h"
 
 static void
 usage(void)