Add le16toh defines for platforms that may be missing it.
diff --git a/miner.h b/miner.h
index 334ba77..872365f 100644
--- a/miner.h
+++ b/miner.h
@@ -160,6 +160,7 @@ static inline int fsync (int fd)
#ifndef htobe32
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define htole16(x) (x)
+# define le16toh(x) (x)
# define htole32(x) (x)
# define htole64(x) (x)
# define le32toh(x) (x)
@@ -170,6 +171,7 @@ static inline int fsync (int fd)
# define htobe64(x) bswap_64(x)
# elif __BYTE_ORDER == __BIG_ENDIAN
# define htole16(x) bswap_16(x)
+# define le16toh(x) bswap_16(x)
# define htole32(x) bswap_32(x)
# define le32toh(x) bswap_32(x)
# define le64toh(x) bswap_64(x)