introduce leul_to_cpu

To be used by next patch.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

bswap.h

diff --git a/bswap.h b/bswap.h
index aace9b7..956f3fa 100644
--- a/bswap.h
+++ b/bswap.h
@@ -205,8 +205,10 @@
 
 #ifdef HOST_WORDS_BIGENDIAN
 #define cpu_to_32wu cpu_to_be32wu
+#define leul_to_cpu(v) le ## HOST_LONG_BITS ## _to_cpu(v)
 #else
 #define cpu_to_32wu cpu_to_le32wu
+#define leul_to_cpu(v) (v)
 #endif
 
 #undef le_bswap