gpgsm: Implement GCM encryption.
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gpgsm: Implement GCM encryption.

* sm/encrypt.c (struct dek_s): Add field 'mode'.
(init_dek): Take the mode from DEK.
(gpgsm_encrypt): Allocate the DEK earlier and set the mode from the
cipher-algo option.  Set content-type depending on the mode.  Adjust
compliance check.  Handle the KSBA_SR_NEED_SIG event by setting the
authtag.

This is the second part to implement GCM encryption. Note that GCM
decryption works since 2.3.2 (nearly 5 years ago). Note that libksba
1.7.0 is required for proper functioning; earlier versions will return
an error during encryption..

See-commit: 047d699aa40c6cd3f35c337091951b62adf32493