[LIBGPG-ERROR] Add Base64 decoder

[NIIBE Yutaka]

Werner Koch <wk at gnupg.org> wrote:
> struct _gpgrt_b64state;
> typedef struct _gpgrt_b64state *gpgrt_b64state_t;

Thanks for your suggestion.  I did that.  Also, I added entries in
visibility.h.  And I added NEWS entry for API change.

I found that the test in GnuPG is for manual testing.  So, I wrote
a simple test.

Hopefully, this is the final version.
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