[LIBGPG-ERROR] Add Base64 decoder

[NIIBE Yutaka]

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Hello,

NTBTLS will require base64 decoder for new API (registering certificate
in PEM format).  Currently, in dirmngr, the caller decodes the PEM
format (in base64) and gives it to NTBTLS library.  Since base64
decoding is also needed in GPGME, it is good for libgpg-error to
have the decoder.

Here is an attempt of mine.
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