build broken with --enable-gcrypt

[Richard Henderson]

The meson conversion seems to have not been properly accomplished for the
gcrypt option: we fail to link against -lgcrypt.

I tried aping the nettle bits, like the following, but it has no effect.  I
don't understand how the "nettle" token works, honestly, since it doesn't
appear to be used at all.


r~

z.txt
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