To avoid all kinds of link-level clashes, rename all old des_*

     [Bodo Moeller]

  +) Change all functions with names starting with des_ to be starting

     with DES_ instead.  This because there are increasing clashes with

     libdes and other des libraries that are currently used by other

     projects.  The old libdes interface is provided, as well as crypt(),

     if openssl/des_old.h is included.  Note that crypt() is no longer

     declared in openssl/des.h.

     In order to maintain compatibility with current applications using

     libcrypto, the old libdes interface is still provided, as long as

     OPENSSL_NO_OLD_DES_SUPPORT is not defined, by automatically including

     openssl/des_old.h. 

     with DES_ instead.  Add wrappers that are compatible with libdes,

     but are named _old_des_*.  Finally, add macros that map the des_*

     symbols to the corresponding _old_des_*.

     All this is done because there are increasing clashes with libdes

     and other des libraries that are currently used by other projects.

     For now, the old libdes interface is provided, as well as crypt(),

     unless OPENSSL_NO_OLD_DES_SUPPORT is defined, or if openssl/des_old.h

     is included.  Note that crypt() is no longer declared in openssl/des.h.

     NOTE: This is a major break of an old API into a new one.  Software

     authors are encouraged to switch to the DES_ style functions.  Some