random: Remove the new API introduced by the new DRBG.
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Description

random: Remove the new API introduced by the new DRBG.

* src/gcrypt.h.in (struct gcry_drbg_gen): Move to random/drbg.c.
(struct gcry_drbg_string): Ditto.
(gcry_drbg_string_fill): Ditto.
(gcry_randomize_drbg): Remove.
* random/drbg.c (parse_flag_string): New.
(_gcry_drbg_reinit): Change the way the arguments are passed.
* src/global.c (_gcry_vcontrol) <GCRYCTL_DRBG_REINIT>: Change calling
convention.

It does not make sense to extend the API for a somewhat questionable
feature. For GCRYCTL_DRBG_REINIT we change to use a string with flags
and libgcrypt's native buffer data structure.

NB: GCRYCTL_DRBG_REINIT has not been tested!