Support for NO_EMBED was removed by commit
22c35a8c2392967 in 1998.
Minitrue attempted to eliminate all mention of it in 2003 with commit
a0a44e237c19cc2b, but missed this code in sdbm.h
#else
# ifndef memcmp
/* maybe we should have included the full embedding header... */
-# ifdef NO_EMBED
-# define memcmp my_memcmp
-# else
-# define memcmp Perl_my_memcmp
-# endif
+# define memcmp Perl_my_memcmp
#ifndef __cplusplus
extern int memcmp proto((char*, char*, int));
#endif